穿紅線

Simplified: 穿红线

chuānhóngxiàn ㄔㄨㄢ ㄏㄨㄥˊ ㄒㄧㄢˋ

    • to play matchmaker
    • to bring a man and woman together

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
thread a red string
Meaning
To play matchmaker and bring an unmarried man and woman together. Light, friendly tone.

Sources