What is another word for conversation stopper?
Pronunciation: [kɒnvəsˈe͡ɪʃən stˈɒpə] (IPA) 
A conversation stopper is a phrase or action that abruptly ends a conversation. There are several synonyms for this term, including a buzzkill, a mood killer, a silencer, a topic changer, or a conversation killer. These words describe a person who disrupts the flow of a dialogue, making everyone uncomfortable or uninterested in continuing the conversation. A buzzkill usually refers to someone who dampens the mood by expressing negativity, while a topic changer awkwardly shifts the discussion to unrelated matters. Meanwhile, a silencer effectively shuts down the conversation with a single remark and a conversation killer makes it impossible to revive the discussion. Whatever the case may be, these words describe the same thing: something that halts a conversation in its tracks.
