Real Dictionary

butt
The butt of a cigarette or cigar is the small part of it that is left when someone has finished smoking it.
The butt or the butt end of a weapon or tool is the thick end of its handle.
countable noun: A butt is a large barrel used for collecting or storing liquid.
countable noun: Someone's butt is their bottom.
singular noun: If someone or something is the butt of jokes or criticism, people often make fun of them or criticize them.
verb: If a person or animal butts you, they hit you with the top of their head.

butt in American English 1
the thick end of anything, as of a whip handle, rifle stock, etc.
to join end to end
noun: the end or extremity of anything, esp. the thicker, larger, or blunt end considered as a bottom, base, support, or handle, as of a log, fishing rod, or pistol

butt in American English 2
to strike or push with the head or horns; ram with the head
noun: a person or thing that is an object of wit, ridicule, sarcasm, contempt, etc.

butt in American English 3
a large barrel or cask, as for wine or beer
intransitive verb: to strike or push something or at something with the head or horns
transitive verb: to strike or push with the head or horns

butt in American English 4
any of various flatfishes, as the halibut or turbot
noun: a large cask for wine, beer, or ale

butt in American English 5
noun: any of several flatfishes, esp. the halibut

Butt in British English
noun: Dame Clara. 1872–1936, English contralto

butt in British English 1
noun: the thicker or blunt end of something, such as the end of the stock of a rifle

butt in British English 2
noun: a person or thing that is the target of ridicule, wit, etc
verb: to lie or be placed end on to; abut

butt in British English 3
verb: to strike or push (something) with the head or horns

butt in British English 4
noun: a large cask, esp one with a capacity of two hogsheads, for storing wine or beer