PHRASAL VERB [no cont, usually imper]安静下来；停止讲话 If you tell someone who is talking a lot or talking too loudly to pipe down, you are telling them to stop talking. 安静下来；停止讲话 [informal]
Just pipe down and I'll tell you what I want. [VERBPREP.]
别说了，我来告诉你我想要什么。
SYN be quiet, shut up [informal], hush, stop talking