ringback

名词 n.
中文释义

英文释义

名词 n.
  1. The sound transmitted back to a caller to indicate that the telephone they are calling is ringing. uncountable
  2. A telephone feature allowing a person to receive an automatic call back when a busy line becomes free. uncountable
    — 'But you've been engaged an awfully long time: I had to use ringback in the end and that's expensive, but this is important so never mind.'

词源

Deverbal from ring back.
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