松口氣

Simplified: 松口气

sōngkǒuqì ㄙㄨㄥ ㄎㄡˇ ㄑㄧˋ

    • to breathe a sigh of relief
    • to relax after tension

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
loosen a breath
Meaning
To relax after tension; to take a breather or breathe a sigh of relief.

Sources