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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.]
References in classic literature ?
Pretty soon the fat steers took it up and began butting and horning each other.
Instead of making the bed, she would amuse herself with pulling off the pillowcases, butting her woolly head among the pillows, till it would sometimes be grotesquely ornamented with feathers sticking out in various directions; she would climb the posts, and hang head downward from the tops; flourish the sheets and spreads all over the apartment; dress the bolster up in Miss Ophelia's night-clothes, and enact various performances with that,--singing and whistling, and making grimaces at herself in the looking-glass; in short, as Miss Ophelia phrased it, "raising Cain" generally.
I had to claw away from the bank pretty lively four or five times, to keep from knocking the islands out of the river; and so I judged the raft must be butting into the bank every now and then, or else it would get further ahead and clear out of hearing -- it was floating a little faster than what I was.