pipe down

• • [美国英语]安静下来；停止叫喊、谈话等；不再那么坚持或过于自信；[俚语]变得较谨慎：

    On seeing the teacher coming, the students in the classroom piped down.

    一看到老师走来，教室里的学生就静下来了。

  • 用管道往下输送：

    The gas was piped down from the central gas station to the sub-stations.

    煤气通过管道从总站往下输送到各分站。

  • 吹哨子下班，吹哨子收工(指甲板上的水手们)：

    It is time to pipe the sailors down.

    该是吹哨让海员们停工的时候了。