shoot off one's mouth 口无遮拦

今天和大家分享的是：
shoot off one's mouth 口无遮拦
A: Don't shoot off your mouth and say something you'll
be sorry for later.
B: I won't. I'll keep my mouth shut.
(A: 别口无遮拦说出事后后悔的话。)
(B: 我不会。我会闭嘴的。)