口くちが過すぎる

expression, ichidan verb

say too much; go too far with one's words

Used when someone says something inappropriate, rude, or better left unsaid, often implying regret or criticism.

• つい口くちが過すぎて、彼かの女じょを怒おこらせてしまった。

  I accidentally said too much and made her angry.

• あの場ばで口くちが過すぎたことを後こう悔かい