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口が堅い

口が堅い (くちがかたい) means to be discreet.

Kana
くちがかたい
Meaning
to be discreet
Japanese Example
彼は口が堅いから、安心して相談できる。
Translation
He is discreet, so I can talk to him without worry.

Related idioms

気がする
きがする
to feel that something is the case
手を焼く
てをやく
to have trouble dealing with something
気がつく
きがつく
to notice; to realize
手がかかる
てがかかる
to require a lot of care