noun

1. An instance or example of using the word "but".

   “It has to be done – no ifs or buts.”

2. The outer room of a small two-room cottage.

3. A limit; a boundary.

verb

1. Use the word "but".

   “But me no buts.”

adverb

1. Merely, only, just.

   “Christmas comes but once a year.”

2. Though, however.

   “I'll have to go home early but.”

3. Used as an intensifier.

   “Nobody, but nobody, crosses me and gets away with it.”

Synonyms: even so, nevertheless, notwithstanding, yet

preposition

1. Apart from, except (for), excluding.

   “Everyone but Father left early.”

2. (obsolete outside Scotland) Outside of.

Synonyms: barring, except for, save for

conjunction

1. On the contrary, rather (as a regular adversative conjunction, introducing a word or clause in contrast or contradiction with the preceding negative clause or sentence).

   “I am not rich but [I am] poor  not John but Peter went there.”

2. However, although, nevertheless, on the other hand (introducing a clause contrary to prior belief or in contrast with the preceding clause or sentence).

   “She is very old but still attractive.”

3. Except that (introducing a subordinate clause which qualifies a negative statement); also, with omission of the subject of the subordinate clause, acting as a negative relative, "except one that", "except such that".

   “I cannot but feel offended.”

Synonyms: bar, excepting, excluding, unless, with the exception of, without, ac, although