下刀子
xià​dāo​zi

to rain knives

下刀子 xià//dāo​zi
to rain knives
To rain knives; used figuratively to describe extremely difficult or dangerous weather conditions or situations where one will proceed regardless of any obstacle.
to play a cruel trick
To use a knife; used figuratively to mean harming someone in a cruel or treacherous way, often behind their back.