Meaning

noun a percussion instrument consisting of a metal plate that is struck with a softheaded drumstick

noun a percussion instrument consisting of a set of tuned bells that are struck with a hammer; used as an orchestral instrument

verb sound a gong

originFrom Middle English gong, from Old English gong, where it was originally a variant of the noun gang (“a going, walk, journey, way, etc.”), derived from the verb gangan (“to go, walk, travel”), whose relation to go in Proto-Germanic remains unclear. Doublet of gang.

Etymology from Wiktionary, CC BY-SA 3.0