fist

Concise Oxford English Dictionary © 2008 Oxford University Press:
fist/fɪst/

▶noun a person's hand when the fingers are bent in towards the palm and held there tightly. ▶verb

• 1 strike with the fist.

• 2 (also fist-fuck) vulgar slang penetrate (a person's anus or vagina) with one's fist.

– phrases
make a —— fist of (or at) informal do something to the specified degree of success.

– derivatives
-fisted adjective,
fistful noun (pl. fistfuls).

– origin OE fȳst, of W. Gmc origin.