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ringback

noun
🔊/ˈrɪŋbæk/
🔊/ˈrɪŋbæk/
(also Callback™)
[uncountable, countable]
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  1. a phone service that you can use if you call somebody and their phone is being used, so that your phone will ring when the line is free; a call made using this service回铃声（电话服务）；有回铃音的电话Topics Phones, email and the internetc2