心服口服

xīnfúkǒufú
(idiom) to accept wholeheartedly; to embrace; to be won over

CEDICT

to be sincerely convinced; to be won over completely

Wiktionary

形容非常服气。《程乙本红楼梦．第五九回》：「如今请出一个管得着的人来管一管，嫂嫂就心服口服，也知道规矩了。」也作「心伏口伏」。

重編國語辭典

Entry Composition

1 心服 xīnfú
  1. to accept wholeheartedly
  2. to embrace
  3. to be won over
2 口服 kǒufú
  1. to take medicine orally; oral (contraceptive etc)
  2. to say that one is convinced