shoot mouth off
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shoot one's mouth off
Inf. to boast or talk too much; to tell secrets. Don't pay any attention to Bob. He's always shooting his mouth off. Oh, Sally! Stop shooting off your mouth! You don't know what you're talking about.
shoot your mouth off
to talk too much or without thinking about something Don't go shooting your mouth off about how much money you're earning.
shoot your mouth off(very informal)
to talk too much, especially about something you should not talk about (often + about ) Don't go shooting your mouth off about how much money you're earning.