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口が

one’s speech; the way one speaks, mouth

→ 口
phrase Uncommon #12,714
one’s speech; the way one speaks Used in expressions describing someone’s manner of speaking or how carefully they keep what they hear to themselves.
JA: 口が悪い奴だ。
EN: He’s foul-mouthed.

彼は口が堅い。

He knows how to keep a secret.

トムは口が堅い。

Tom can keep a secret.

口が悪い奴だ。

What a foul-mouthed guy.

phrase Rare #37,348
mouth The mouth as the body part used for eating and speaking; が marks it as the subject.
JA: コショウで彼の口がひりひりした。
EN: The pepper made his mouth tingle.

スパーホークの口が小さく「お」の形になった。

Sparhawk's mouth formed a small O.

口がデカいのはお前だ

You're the one with the big mouth.

— ワンス・アポン・ア・タイム・イン・ハリウッド (2019)