Google N-gram Corpus Counts
╭─ーーーーー─┬───────┬───────╮
│ 叩き伏せ　 │ 3,265 │ 88.1% │
│ たたき伏せ │   271 │  7.3% │
│ 叩きふせ　 │   117 │  3.2% │
│ たたきふせ │    52 │  1.4% │
╰─ーーーーー─┴───────┴───────╯

@@ -8,0 +9,4 @@
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>叩きふせる</keb>

N-gram

Encountered this spelling in the CCs for キノの旅 -the Beautiful World-.

@@ -5,0 +6,4 @@
+</k_ele>
+<k_ele>
+<keb>たたき伏せる</keb>
+<ke_inf>&sK;</ke_inf>

@@ -28 +28 @@
-<gloss>using ones hands backwards from their conventional positioning</gloss>
+<gloss>using one's hands backwards from their conventional positioning</gloss>

Quiet

Thanks for the detailed discussion, and sorry for not making the time to address it properly. A few light edits, and if no-one else has changes I'll approve in a couple of days.

@@ -20 +20,2 @@
-<gloss>underhand grip (e.g. in gymnastics, on a pullup-bar, etc.)</gloss>
+<field>&sports;</field>
+<gloss>underhand grip (e.g. in gymnastics, etc.)</gloss>
@@ -25 +26,2 @@
-<gloss>cross-handed grip (e.g. in golf, baseball, etc.)</gloss>
+<field>&sports;</field>
+<gloss>cross-handed grip (e.g. in golf, etc.)</gloss>
@@ -31 +33 @@
-<gloss>reverse grip (e.g. of a sword, with one's pinky by the blade)</gloss>
+<gloss>reverse grip (e.g. of a sword)</gloss>

https://furigana.info/w/逆手
さかて	86.1%
ぎゃくて	5.6%
さかで	5.6%

1990 NHK study on pronunciation change, google translated for convenience:
https://www.nhk.or.jp/bunken/summary/kotoba/gimon/103.html
There are two ways to read "逆手": "gyakute" (the on-reading of "gyaku") and "sakate" (the kun-reading). When used in a figurative way, such as "take advantage of the opponent's moves," "gyakute" has traditionally been the common reading, and most dictionaries use the reading "gyakute." However, in a survey conducted by NHK in March 1990 targeting people aged 16 and over living in the Tokyo metropolitan area, over 70% of respondents said they read "take advantage of the opponent's moves" as "sakate," and subsequent surveys have also shown a trend toward more people reading it as "sakate."
For this reason, the broadcast reads "gyakute" as follows:
"Take advantage of your opponent's moves"
① Gyakute ② Sakate
Other examples of "gyakute" are as follows:
(1) "Take the reverse hand" in judo, etc. - Gyakute
(2) "Hold or hold a short sword or sword in the reverse hand" - Sakate
(3) "Reverse hand wheel" on the horizontal bar in gymnastics - Sakate

========

Golf tutorial, speaker explains "右手と左手を逆(ぎゃく)に持つ", then names the grip 逆手（さかて）グリップ　
https://youtu.be/ebUEtgq_GaU?t=80

https://zatugaku-gimonn.com/entry1683.html#a1
一般的には逆手は「さかて」と読むことがほとんどです。

Several comments say the same thing about the reading:
https://ja.hinative.com/questions/21864634
基本的には『逆手(さかて)』と言うことが多いと思います。
単語として『逆手(ぎゃくて)』と言う場合は、「逆手に掴む」のように、物の掴み方などに用いることはあります。
Ex. 『鉄棒を逆手(ぎゃくて)に持つ』

In Japanese martial arts, is 逆手 a valid word to describe joint lock techniques as a general group?
https://hinative.com/questions/16776481
I think 関節技 (kansetsu waza, joint locking technique) is a much more common expression. 逆手 sounds using/griping something such as a Japanese sword in an unusual manner, and does not make sense for most Japanese unless they are familiar with martial arts.

https://budojapan.com/aiki-jujutsu/gyakute01/
Gyakute-do is an unique system specializing in Gyakute Waza, or wrist/arm joint lock techniques. Everyone who read this book will notice that most of the techniques are based on wrist/arm joint locks. 

Pauley's Guide: A Dictionary of Japanese Martial Arts and ... - Page 139
SAKATE holding a sword or knife with the point oriented downwards Sakate ( grip )

和英英和語林集成 - Page 523 (hepburn, 1886)
Grasping the handle of a sword or knife , so that the point is down- wards : 

The entry below is for [5] and is consistent with sankoku[3]: 卑怯な・いじの悪いやり方
https://ejje.weblio.jp/content/foul+trick
JST科学技術用語
foul trick

https://swordis.com/blog/reverse-sword-grip/
The term “reverse grip” in swordsmanship refers to holding the sword, knife, or any type of bladed-edged weapon, with its blade pointing downward, which is different from the traditional grip.

Sorry for the length, a lot going on here.

Encountered as さかて, "turning-tables" sense.  Online refs suggest さかて dominates in modern Japanese.

Conferred with young native speaker.  4th-year male college student was incredulous that this would *ever* be pronounced ぎゃくて.  I asked "even in judo?"; he didn't think so, but he wasn't a judo student either.  He conferred with another friend, they agreed that ぎゃくて sounded erroneous.  This matches NHK's study from 1990, plus 35 years of change. 

I know we don't like stacks of glosses, but [1] and [2] are materially different, and [1] usually gets its own kokugo entry.  Google "逆手 鉄棒" and you'll see gymnastics, pull-up bars, children's playground equipment, etc.  Quite common for what it is. [2] exists, but not so common, and critically the xrefs are different.  The sword-sense [3] has a particular affinity with さかて(daijs, sankoku, NHK) and must not be read ぎゃくて, so cannot be combined with the others.

"Backhand grip" is ambiguous in tennis.  I tried to find a definitive mapping for tennis, even watching youtube videos.  Most common is a two-handed forehand, where 逆手 indicates the relative placement of the hands.  In the video below, it's a two-handed forehand.  Can you have a forehand with a backhand grip?
両手フォアの打ち方解説！両手フォア(逆手)のスピンのかけ方！
https://www.youtube.com/watch?v=GGh-d1ZF7wQ

I found no support for [5] except that it's in the dictionary quite clearly.

I removed "unexpected twist" from the figurative gloss. It seems misleading and very situationally dependent. Perhaps if you're the victim of having the tables turned on you? Doesn't seem supported by the kokugo definitions, or appear in any other refs.

@@ -9,0 +10,3 @@
+<reb>さかて</reb>
+</r_ele>
+<r_ele>
@@ -14,3 +16,0 @@
-<r_ele>
-<reb>さかて</reb>
-</r_ele>
@@ -20,2 +20 @@
-<gloss>underhand grip</gloss>
-<gloss>backhand grip (e.g. in tennis)</gloss>
+<gloss>underhand grip (e.g. in gymnastics, on a pullup-bar, etc.)</gloss>
@@ -25 +24,12 @@
-<gloss>unexpected twist</gloss>
+<xref type="see" seq="2863293">クロスハンド</xref>
+<gloss>cross-handed grip (e.g. in golf, baseball, etc.)</gloss>
+<gloss>using ones hands backwards from their conventional positioning</gloss>
+</sense>
+<sense>
+<stagr>さかて</stagr>
+<pos>&n;</pos>
+<gloss>reverse grip (e.g. of a sword, with one's pinky by the blade)</gloss>
+</sense>
+<sense>
+<pos>&n;</pos>
+<xref type="see" seq="2109310">逆手に取る</xref>
@@ -26,0 +37,14 @@
+</sense>
+<sense>
+<pos>&n;</pos>
+<xref type="see" seq="1215990">関節技</xref>
+<field>&MA;</field>
+<s_inf>oft. ぎゃくて</s_inf>
+<gloss>reverse arm-lock (in judo)</gloss>
+<gloss>joint lock</gloss>
+</sense>
+<sense>
+<stagr>ぎゃくて</stagr>
+<pos>&n;</pos>
+<misc>&rare;</misc>
+<gloss>foul trick</gloss>

@@ -16 +16 @@
-<xref type="see" seq="1873650">決を取る</xref>
+<xref type="see" seq="1873650">決を採る</xref>

アセットマネージメント	3143	3.5%
アセット・マネージメント	625	0.7%
アセットマネジメント	80135	90.3%
アセット・マネジメント	4809	5.4%

@@ -4,0 +5,6 @@
+<reb>アセットマネジメント</reb>
+</r_ele>
+<r_ele>
+<reb>アセット・マネジメント</reb>
+</r_ele>
+<r_ele>
@@ -5,0 +12 @@
+<re_inf>&sk;</re_inf>
@@ -8,0 +16 @@
+<re_inf>&sk;</re_inf>

Added additional dotted reading(s) via batch update.Added additional dotted reading(s) via batch update.
-*- via bulkupd.py -*-

@@ -6,0 +6,3 @@
+</r_ele>
+<r_ele>
+<reb>アセット・マネージメント</reb>

スクレイピー	6512	89.0%
スクレーピー	677	9.3%
スクレピー	128	1.7% gg5

@@ -5,0 +6,8 @@
+</r_ele>
+<r_ele>
+<reb>スクレーピー</reb>
+<re_inf>&sk;</re_inf>
+</r_ele>
+<r_ele>
+<reb>スクレピー</reb>
+<re_inf>&sk;</re_inf>

Entry created

It would be read もういっちょう. I have suggested it as a new entry.

ran into もう一丁

Seems OK.

@@ -4,3 +4,0 @@
-<k_ele>
-<keb>もういっちょ</keb>
-</k_ele>
@@ -11,2 +8,6 @@
-<pos>&adv;</pos>
-<gloss>once more (colloquial slur of もう一度)</gloss>
+<pos>&exp;</pos>
+<xref type="see" seq="2005860">もう一度・もういちど</xref>
+<misc>&col;</misc>
+<s_inf>from もう一度</s_inf>
+<gloss>once more</gloss>
+<gloss>again</gloss>

Takemiya Yuyuko, "Toradora Spinoff 2", page 168.  Text there 「さらに蹴り飛ばし、壁にぶつかって原型もとどめなくなったそいつをもういっちょ踏んづけて平面の物体でさえないモノにした。」

This can be seen on a number of blogs, but not in any dictionary that I see.  It seems to fit the form of most contractions.  Opinions, anyone?

@@ -15,0 +16 @@
+<xref type="see" seq="2715930">格安航空会社</xref>

daijs chiezo

@@ -8 +8 @@
-<reb>だつおた</reb>
+<reb>だつオタ</reb>

脱おた	44

daijr:
だつおた[0]【脱おた】
⇨脱御宅

脱オタ　 38,757  75.8% 
脱オタク 12,342  24.2% 
脱御宅　      0   0.0%

Indeed.

https://www.japaneselawtranslation.go.jp/ja/laws/view/1945
actually called "tax interest" here which makes more sense

@@ -12 +12 @@
-<gloss>interest tax</gloss>
+<gloss>tax interest</gloss>

Daijs: 国税について延納または納税申告書の提出期限の延長が認められた場合に、その期間に応じて課せられる付帯税。

THe JEs all have "interest tax", which I think is painfully 直訳.

@@ -13 +13 @@
-<gloss>interest on deferred tax payments</gloss>
+<gloss>interest charged on deferred tax payments</gloss>

eij daij etc.

保存地区	63281
Eijiro, GG5 (風致保存地区 a scenic preservation 「area ［district］.)

Probably worth having.

@@ -13,0 +14 @@
+<gloss>preservation district</gloss>

https://www.denken.gr.jp/archive/kyoto-sagatoriimoto/index.html
保存地区は清滝を経て愛宕神社へ通じる愛宕街道に沿った約600メートルの範囲で、化野念仏寺の参道があり、奥に愛宕神社の一の鳥居が建つ。
保存地区	63281

daijs

daij

スパマー	39806

https://ja.wikipedia.org/wiki/マイスナー効果

Google N-gram Corpus Counts
╭─ーーーーーーーーーーーーーーー─┬───────╮
│ マイスナー効果　　　　　　　　 │ 2,580 │
│ 完全反磁性　　　　　　　　　　 │   609 │
│ マイスナーオクセンフェルト効果 │     0 │
╰─ーーーーーーーーーーーーーーー─┴───────╯

gg5, koj, daij

マイスナー効果	2580

daijs

ディスオーダー	5932	85.0%
ディスオーダ	83	1.2%
ディソーダー	965	13.8%
ディソーダ	0	0.0%

gg5, prog, daijr
https://ja.wikipedia.org/wiki/反磁性

Google N-gram Corpus Counts
╭─ーーーーー─┬───────╮
│ 反磁性　　 │ 4,474 │
│ はんじせい │    72 │
╰─ーーーーー─┴───────╯

Quiet

もう一度	8595903
もう一丁	25301
もういっちょ	99299
もう一つ	4000937
https://japanese.stackexchange.com/questions/24201/why-is-another-photo-referred-to-as-もう一丁
https://thesaurus.weblio.jp/content/もう一丁

Seems a jokey version. Probably worth having.