Answer: conk

AnswerCrossword Clue
CONKHit
CONK... out (go dead)
CONKBop on the head
CONKKnock out
CONKKin of bop
CONK... out (stall)
CONKSandbag
CONKFail suddenly, with "out"
CONKGo pffft, with "out"
CONKGo pfft, with "out"
CONKCollapse, with "out"
CONKCrash, with "out"
CONKStall, with "out": Slang.
CONK... out: die
CONKStop running (with "out")
CONKCrown
conkto go to sleep
conkto slow down or stop; lose energy.
conkto strike on the head
conkto break down
conknose
conkto hit on the head, also KONK
conkblow on the head
CONK... out (fizzle)
CONKBop
CONKStraighten, as hair
CONKBrain
CONKRap on the head
CONKHit on the head
CONKStop running, with "out"
CONKBop on the bean
CONKBop on the noggin
CONKDie, with "out"
CONKGo to sleep, with "out"
CONKKnock on the noggin
CONKKnock on the noodle
CONKGo kaput, with "out"
CONKBean
CONKNoggin
CONKFail, with "out"