quinsey, v. — Green’s Dictionary of Slang

quinsey v.

[backform. f. hempen quinsey, a synon. for the hangman’s rope (cf. hempen cravat under hempen adj.)]

(US Und.) to choke, to garotte.

1859		Matsell Vocabulum 72: ‘Quinsey the bloke while I frisk his sacks,’ choke the fellow while I pick his pockets.
1895		C. Crowe Aus. Sl. Dict. 64: Quinsey, choked.