conk

Short definition from Wiktionary

Noun

1. 1
   The shelf- or bracket-shaped fruiting body of a bracket fungus (also called a shelf fungus), i.e. a mushroom growing off a tree trunk.
2. 2
   A nose, especially a large one.
3. 3
   Alternative spelling of conch.
4. 4
   A hairstyle involving the chemical straightening and styling of kinky hair.

Verb

1. 1
   To hit, especially on the head.
2. 2
   To chemically straighten tightly curled hair.
3. 3
   To fail or show signs of failing, cease operating, break down.
4. 4
   To become unconscious.