倒行逆施
After meat, mustard.
After death, the doctor.
Put the cart before the horse.
Put the clock back.

eg：To put the cart before the horse is to turn things upside down.

中英俚语俗语来源：史记·伍子胥列传：“吾日暮途远，吾故倒行而逆施之。”

同义词：本末倒置 Turn topsy-turvy.
反义词：随波逐流 Go with the tide.