Green’s Dictionary of Slang

charming wife n.

a knife.

1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 52: Charming Wife: Knife.
1949		Monteleone Criminal Sl. (rev. edn).
1960		J. Franklyn Dict. of Rhy. Sl.
1977		D. Powis Signs of Crime 177: Charming wife Knife.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.