run off at the mouth
US /rʌn ɔf æt ðə maʊθ/
UK /rʌn ɔf æt ðə maʊθ/
1.
口が軽い, おしゃべりすぎる, 秘密を漏らす
to talk too much, especially in a boastful or indiscreet way
:
•
He tends to run off at the mouth when he's had a few drinks.
彼は少しお酒を飲むと口が軽くなる傾向がある。
•
Don't tell him your secrets; he'll just run off at the mouth to everyone.
彼に秘密を話さないで。彼はすぐに口を滑らせてみんなに話してしまうだろう。