前俯后仰 qián fǔ hòu yǎng

DEFINITIONS

  1. to rock one's body backward and forward
  2. to be convulsed (with laughter etc)

CHARACTERS

前 qián in front, forward; preceding
俯 fǔ bow down, face down, look down
后 hòu queen, empress, sovereign; (simp. for 後) behind, rear, after
仰 yǎng raise the head to look; look up to, rely on, admire