jmdict 1792810 Active (id#2224385)
寝刃
【 ねたば 】
  1. [n]
    • dull blade
    • blunt sword
History:
    • A 2023-03-11 21:13:40 Jim Breen (id#2224385)
    • Refs
      GG5
    • Diff
      @@ -12,0 +13 @@
+<gloss>blunt sword</gloss>
    • A* 2023-03-11 09:25:25 Brian Krznarich (id#2224350)
    • Comments
      Searched  for "blade(d" glosses and this was the only match.

Setting that aside:
1. Both dictionary entries I have specifically refer to the blade itself
2. In English, we can already use "blade" to mean "the entire sword/knife" if we like.
    • Refs
      daijs.
刀剣の、切れ味の鈍くなった刃。「―を研ぐ」

sankoku
切れ味のにぶった刃
    • Diff
      @@ -12 +12 @@
-<gloss>dull blade(d instrument)</gloss>
+<gloss>dull blade</gloss>
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