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English definition of “conversation-stopper”

conversation-stopper

noun [C usually singular] uk   us  
a remark that stops the natural flow of the conversation because it is unexpected and in some way causes embarrassment or shock: When she told us her son was in prison, it was a real conversation-stopper.Informal talking and conversation
(Definition of conversation-stopper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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