conversation stopper
noun/ˌkɒnvəˈseɪʃn stɒpə(r)/
/ˌkɑːnvərˈseɪʃn stɑːpər/
(informal)- a remark that is unexpected or that shocks people so that they do not know how to reply to it
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conversation stopper
Definition of conversation stopper noun from the Oxford Advanced Learner's Dictionary