(sometimes lowercase) a small, simple musical instrument consisting of a lyre-shaped metal frame containing a metal tongue, which is plucked while the frame is held in the teeth, the vibrations causing twanging tones.
Also, Jews' harp.
Origin of Jew's harp
1585-95; perhaps jocular; earlier called Jew's trump
a musical instrument consisting of a small lyre-shaped metal frame held between the teeth, with a steel tongue plucked with the finger. Changes in pitch are produced by varying the size of the mouth cavities