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English definition of “you could have heard a pin drop”

you could have heard a pin drop

something that you say in order to describe a situation where there was complete silence, especially because people were very interested or very surprised by what was happening: Margaret's ex-husband turned up at the wedding. Honestly, you could have heard a pin drop.
(Definition of you could have heard a pin drop from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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