由盛转衰 yóu shèng zhuǎn shuāi

DEFINITIONS

  1. from prosperity to decline
  2. at its peak before the decline

CHARACTERS

由 yóu cause, reason; from
盛 shèng abundant, flourishing; contain; fill
转 zhuǎn shift, move, turn
衰 shuāi decline, falter, decrease; weaken