Meaning of “conversation-stopper” in the English Dictionary

british dictionary

"conversation-stopper" in British English

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conversation-stoppernoun [ C usually singular ]

uk /kɒn.vəˈseɪ.ʃənˌstɒp.ər/ us /kɑːn.vɚˈseɪ.ʃənˌstɑː.pɚ/

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.

(Definition of “conversation-stopper” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)