JLPT N3Idioms

胸を張る

Meaning
自信を持って堂々と振る舞う
Explanation
「胸を張る」 means to take a proud, confident, and dignified attitude. The expression comes from the posture of standing with the chest thrust forward. It has nothing to do with deep breathing or building muscle.
Original Japanese explanation

「胸を張る」は、自信を持って堂々とした態度をとるという意味です。胸を前に出して立つ姿から生まれた言い方です。深呼吸や筋肉を鍛えることとは関係ありません。

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