"let off a smile" sounds odd to me.
札を崩す has been deleted, so I'll put it in a note...

@@ -42,0 +42,1 @@
+<s_inf>oft. 札を崩す, etc.</s_inf>
@@ -57,0 +58,1 @@
+<gloss>to break into a smile</gloss>

See below.

Following the recent exchanges based on my submission under "お金をこわす ； お金を壊す" and Rene's comments under para (2), namely: "2) regarding the proposed entry for お金を崩す (which should have been submitted as a new entry, not a comment here), i do not see the need.  it is standard use of くずす.  to make this clear, i have split the senses in that entry"

Now that we have that split, I wounder if you would consider a cross reference link in the above, namely: e,g.,[4][v5s,vt] to break (a bill); to change; to make change　(See 札を崩す),i.e., to link with the following existing useful entry [or vice versa]:-

札を崩す 【さつをくずす】 (exp,v5s) to change a note; to break a bill

Although, unlike the general usage in the entry of "お金をこわす; お金を壊す 【おかねをこわす】 (exp,v5s) (nab:) (See 壊す・3) to make change; to break a bill", "札を崩す" does at least still give the searcher a sense of actual usage.

alignign with 壊す

@@ -42,1 +42,1 @@
-<gloss>to break (e.g. a 10,000-yen note)</gloss>
+<gloss>to break (a bill)</gloss>

suggesting a new sense for 姿勢を崩す, 
daijs: "「ひざを―・して楽にする」「強気の構えを―・さない」"
prog: "どうぞひざをお崩しください
Please sit at ease."
__
in prog these are sense II:1 "〔整ったものを乱す〕" i.e. our 
sense 2, in daijs they are semi-separate (２:ア　and 2:イ 
respectively)
but this "to let loose" sense just doesn't go well with "to 
make shaky" and "to disturb".
___
to let off a smile - "３ （「相好(そうごう)をくずす」などの形で）顔をほ
ころばす。"

@@ -36,2 +36,2 @@
-<gloss>to break (e.g. a 10,000-yen note)</gloss>
-<gloss>to change</gloss>
+<gloss>to relax (one's pose)</gloss>
+<gloss>to make oneself at ease</gloss>
@@ -42,0 +42,8 @@
+<gloss>to break (e.g. a 10,000-yen note)</gloss>
+<gloss>to change</gloss>
+<gloss>to make change</gloss>
+</sense>
+<sense>
+<pos>&v5s;</pos>
+<pos>&vt;</pos>
+<s_inf>oft. as 字を崩す</s_inf>
@@ -44,0 +52,6 @@
+</sense>
+<sense>
+<pos>&v5s;</pos>
+<pos>&vt;</pos>
+<s_inf>as 顔を崩す, etc.</s_inf>
+<gloss>to let off a smile</gloss>

reopening