1. [early 19C; 1920s+] to hit, esp. on the nose or head, to knock out.
2. [1910s–40s] (US) to kill.
3. [1940s] in fig. use, i.e. to burden with, to assail.
4. see conk (out) v.
1. [1940s] to kill.
2. [1940s+] to fall asleep, to sleep.
3. [1950s–60s] to stop work, to skive.
4. [1950s–60s] to die.
see separate entry.