JLPT N3Idioms

口が軽い

Meaning
秘密や他人の話をすぐに人に話してしまう
Explanation
「口が軽い」 means readily telling secrets or others' affairs to other people. Conversely, a person who can keep secrets is said to be 「口が堅い」. Be careful, as it does not mean being taciturn.
Original Japanese explanation

「口が軽い」は、秘密や人の話をすぐにほかの人に話してしまうという意味です。反対に、秘密を守れる人は「口が堅い」と言います。無口という意味ではないので注意しましょう。

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