疲於奔命

To be weary or exhausted; feeling tired; to make tired; to be fed up; weak or aged; low prices and slow sales.

Mainly a function word; indicates location (in, at, on); direction (to, toward); relation (with, for); comparison (than); or passive voice (by); also a surname.

To run quickly; to rush towards a destination; to flee or escape; to elope; describing something that moves fast.

life; destiny or fate; an order or command; to assign a name or title; to take or appoint.