Meaning of “butt” - Learner’s Dictionary

butt

noun uk us /bʌt/
BOTTOM [ C ] US informal

your bottom:

He just sits on his butt all day long.
CIGARETTE [ C ]

the end of a cigarette that is left after it is smoked:

There were cigarette butts all over the floor.
GUN [ C ]

the end of the handle of a gun:

the butt of a rifle
a head butt

the act of hitting someone with the top, front part of your head

(Definition of “butt noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)