laugh down   (TTS發音)

defeat， dismiss or silence by laughing用笑聲壓倒、拒絕或打斷

    The audience laughed the speaker down. 聽眾的笑聲打斷了演講者的談話。

    I don't know why they laughed down my proposal. 我不懂他們為什麼用笑聲來拒絕我的建議。