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conk (v.)

as in conk out, 1918, coined by World War I airmen, perhaps in imitation of the sound of a stalling motor, reinforced by conk (v.) "hit on the head," originally "punch in the nose" (1821), from conk (n.), slang for "nose" (1812), perhaps from fancied resemblance of the nose to a conch (pronounced "conk") shell.

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Definitions of conk from WordNet
1
conk (v.)
come to a stop;
Synonyms: stall
conk (v.)
hit, especially on the head;
The stranger conked him and he fainted
conk (v.)
pass from physical life and lose all bodily attributes and functions necessary to sustain life;
Synonyms: die / decease / perish / go / exit / pass away / expire / pass / kick the bucket / cash in one's chips / buy the farm / give-up the ghost / drop dead / pop off / choke / croak / snuff it
conk (v.)
pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain;
Synonyms: faint / swoon / pass out
2
conk (n.)
informal term for the nose;
From wordnet.princeton.edu