正襟危坐

zhèng jīn wēi zuò

Meaning

to sit upright and still (idiom)

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Characters

正zhèngstraight, right, proper, correct, just, true一止襟jīnlapel, collar衤禁危wēidangerous, precarious; high厃㔾坐zuòseat; to sit; to ride, to travel by从土