松口 sōngkǒu to let go Origin Definitions Defs Strokes Stroke Words Sentences Sents 松口气 sōngkǒuqì to breathe a sigh of relief To relax one's tension or to heave a sigh of relief after a period of stress or effort.松口蘑 sōngkǒumó matsutake matsutake (Tricholoma matsutake); an edible mushroom considered a great delicacy