(historical) Originally, an entertainer employed to juggle, play music, sing, tell stories, etc.; a buffoon, a fool, a jester; later, a medieval (especially travelling) entertainer who would recite and sing poetry, often to their own musical accompaniment.

(by extension) A lyric poet, musician, or singer, historically also referring to a member of a troupe of entertainers who performed in minstrel shows, and slang for an amphetamine tablet.

(transitive) To play (a tune on a musical instrument); to sing (a song).

(intransitive) To act as a minstrel; to entertain by playing a musical instrument, singing, etc.