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Jyutping lin4 mak6
Pinyin lián mài

Definitions (Wiktionary)
  1. verb, neologism, slang, verb-object
    to activate one's microphone; to have an audio chat

連麥 [连麦]

Jyutping
Pinyin lián mài

Definitions (CC-CEDICT)
  1. (of two people in different locations) to sing or otherwise perform together using communications technology