: a fluctuating muted effect produced on a brass instrument by use of a mute (see mute entry 2 sense 1) or on an electric guitar by use of a pedal (see pedal entry 1 sense 1b) connected to an amplifier
[Elizabeth] Start uses a lot of "effects"—trumpet wah-wahs, … glissandi galore.—John Y. Lawrence … begins with funk guitar wah-wahs …—Philip Brandes
—often used before another noun
a wah-wah effect
In 1931, [American jazz trumpeter Clyde McCoy] recorded "Sugar Blues," utilizing his muted wah-wah sound, which became his theme song.—William F. Lee
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