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口が軽い

loose-lipped

→ 口
phrase Rare #45,506
loose-lipped Describes someone who tends to reveal secrets or share things they should keep private.
JA: 彼は口が軽いから、秘密を話さないほうがいい。
EN: He’s loose-lipped, so you shouldn’t tell him a secret.

彼女は口が軽い。

She can't keep a secret.

あいつ、ほんと口が軽いからな。

He's really loose-lipped, you know.

彼は口が軽い。

He can't keep a secret.

トムは口が軽い。

Tom can't keep a secret.