Definition of gong noun from the Oxford Advanced American Dictionary

 

gong

 noun
noun
NAmE//ɡɑŋ//
 
, NAmE//ɡɔŋ//
 
 
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a round piece of metal that hangs in a frame and makes a loud, deep sound when it is hit with a stick. Gongs are used as musical instruments or to give signals, for example that a meal is ready. to bang/beat/sound a gong the breakfast/dinner gong
See the Oxford Advanced Learner's Dictionary entry: gong