前俯后仰

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

front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly

empress / queen / (archaic) monarch / ruler

back / behind / rear / afterwards / after / later / post-

surname Yang

to face upward / to look up / to admire / to rely on

variant of 俯[fu3]

to look down / to stoop