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butt 1

v. butt·ed, butt·ing, butts
To hit or push against with the head or horns; ram.
1. To hit or push something with the head or horns.
2. To project forward or out.
A push or blow with the head or horns.
Phrasal Verbs:
butt in
1. To interfere or meddle in other people's affairs.
2. To interrupt the conversation or activity of other people.
3. To move into a line of people or things out of turn.
butt out Slang
To disengage from a matter involving another person.

[Middle English butten, from Old French bouter, to strike, of Germanic origin; see bhau- in Indo-European roots.]

butt′er n.

butt 2

tr. & intr.v. butt·ed, butt·ing, butts
To join or be joined end to end; abut.
1. A butt joint.
2. A butt hinge.

[Middle English butten, from Anglo-Norman butter (variant of Old French bouter; see butt1) and from but, end; see butt4.]

butt 3

1. One that serves as an object of ridicule or contempt: I was the butt of their jokes.
a. A target, as in archery or riflery.
b. butts A target range.
c. An obstacle behind a target for stopping the shot.
3. An embankment or hollow used as a blind by hunters of wildfowl.
a. Archaic A goal.
b. Obsolete A bound; a limit.

[Middle English butte, target, from Old French, from but, goal, end, target; see butt4.]

butt 4

1. The larger or thicker end of an object: the butt of a rifle.
a. An unburned end, as of a cigarette.
b. Informal A cigarette.
3. A short or broken remnant; a stub.
4. Informal The buttocks; the rear end.
Slang Very. Used as an intensive: butt ugly; butt expensive.

[Middle English butte, from Old French but, end, of Germanic origin.]

butt 5

1. A large cask.
2. A unit of volume equal to two hogsheads, usually the equivalent of 126 US gallons (about 477 liters).

[Middle English, from Old French boute, from Late Latin *buttia, variant of buttis.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Pretty soon the fat steers took it up and began butting and horning each other.
The reason Big Butt is being re-released is that our fans not only asked for it, but demanded it." Big Butt is a double-bock, and is named not for a large posterior, but for the label image of two goats butting heads.