Green’s Dictionary of Slang

conk v.2

also konk, kunk
[conk n.1 (1)/conk n.1 (5) + echoic]

1. to hit, esp. on the nose or head, to knock out.

[UK]Egan Boxiana III 338: Spring however conked his opponent, when they closed.
[UK]Derby Dly Teleg. 7 Apr. 3/3: Schoolboy slang [...] to hit — bash, conk.
[US]R. Chandler ‘Blackmailers Don’t Shoot’ Red Wind (1946) 112: If I didn’t get conked out of hand, I might learn who was who.
[US]E. O’Brien One Way Ticket 73: The steam gauge is over there, and the first time you let the steam drop or the water get outa sight I’ll konk ya with this monkey wrench.
[WI]‘Uncle Newton’ Ups and Downs of Newsy Wapps Bk 1 31: I squirm and wriggle and fuss and she ‘Kunks’ me in my head.
[US]Mezzrow & Wolfe Really the Blues 70: Mac would conk the ugly customers on the top and carry them outside.
[US]Kerouac On the Road (The Orig. Scroll) (2007) 180: I don’t like that fairy at the bar [...] I think I’ll get up and conk him.
[US]A.J. Liebling Honest Rainmaker (1991) 114: I am lucky that he did not konk me with the cane.
[US]H. Selby Jr Last Exit to Brooklyn (1966) 73: She relaxed and gave it thought. Cant konk im here.
[US]R. Coover Public Burning (1979) 271: The b-girl retaliates by conking him over the head with another beer bottle.
[WI]O. Senior ‘The Boy Who Loved Ice Cream’ Summer Lightning 85: Stan still yu jumbo-head bwoy or a konk yu till yu fenny.
[US]B. Hamper Rivethead (1992) 111: I wondered what approach he might have taken had it been his own grandmother konked silly and heaped on the Rivet Line floor.
[US]H. Roth From Bondage 281: The newspapers were just as full today as they were when he was conked on the bean with newspaper bludgeons.
[US]J. Stahl Plainclothes Naked (2002) 106: No doubt he’d just as soon have conked an old lady for her pin money.
[Aus] A. Bergen ‘Dread Fellow Churls’ in Crime Factory: Hard Labour [ebook] I’m not surprised my quarry nutted me out first, tiptoed up behind me and conked me on the skull.

2. (US) to kill.

[US]E.M. Roberts Flying Fighter 334: Conked. A new word which is taken from the Russian language and which means stopped or killed.
[US]J.J. Finerty Criminalese.
[US]E.H. Price ‘Revolt of the Damned’ in Double-Action Gang June [Internet] ‘Luck?’ ‘Uhuh. Number ten conked,’ Benny reported.
[US]D.X. Manners ‘Fifty-Grand Funeral’ in Ten Detective Aces Dec. [Internet] You haven’t had a client since Cain conked Abel.
[US]H. McCoy Kiss Tomorrow Goodbye in Four Novels (1983) 105: He was yellow. That’s what caused him to get conked.

3. in fig. use, i.e. to burden with, to assail.

[US]Charleston (WV) Daily Mail 2 Sept. 6/5: Me schmaltzy gabber couldn’t red a Chicago piano rap, so the D.A. conks me with a whole mag.

4. see conk (out) v.

In phrases

conk off (v.) (orig. US)

1. to kill.

[US] in Destination Tokyo [film script] If we got conked off, do you think we’d see our folks in the hereafter [HDAS].

2. to fall asleep, to sleep.

in Calif. Folklore Quarterly 387: Whoever knocks off work in order to rest or sleep conks out, conks off, caulks off or flakes out.
[UK]I, Mobster 88: You been conking off for eight hours nearly.
[US]Wentworth & Flexner DAS.

3. to stop work, to skive.

[US]Wentworth & Flexner DAS.

4. to die.

[UK]S. Selvon Lonely Londoners 117: Moses [...] frighten like hell that the woman might conk off on his hands.
[US]J. Susann Valley of the Dolls 395: He thought she’d conk off in a few years.
conk out (v.)

see separate entry.