call waiting

noun
🔊/ˌkɔːl ˈweɪtɪŋ/
🔊/ˌkɔːl ˈweɪtɪŋ/
[uncountable]
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  1. a phone service that tells you if somebody is trying to call you when you are using the phone来电等待服务,插拨服务(通话时提醒用户有人正在打进电话)Topics Phones, email and the internetc2