disco ball

noun
🔊/ˈdɪskəʊ bɔːl/
🔊/ˈdɪskəʊ bɔːl/
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  1. a decoration for a party, nightclub, etc. consisting of a hanging ball covered in small mirrors that shine in the lights
    • They danced under a glittering disco ball.他们在闪闪发光的迪斯科舞会上跳舞。