俯仰由人

- submit oneself to sb.'s whims and fancies; be at other's beck and call; be at sb.'s mercy; be at the disposal of others; be led by the nose of others; be twisted round sb.'s finger; follow others servilely; give oneself up at sb.'s disposal; He is entirely subject to the will of other people.; It is for others to tell him when to turn upward, and when to turn downward his face.; in a short moment; in the briefest space of time; live under the thumb of others; stand [be] at sb.'s beck and call