A musical instrument consisting of a body and a curved neck, strung with strings of varying length that are stroked or plucked with the fingers and are vertical to the soundboard when viewed from the end of the body
A harmonica.
A grain sieve.
(usually with on) To repeatedly mention a subject.
Why do you harp on a single small mistake?
To play on (a harp or similar instrument)
To play (a tune) on the harp.
To develop or give expression to by skill and art; to sound forth as from a harp; to hit upon.