Brown Driver Briggs

 1. to bow, crouch, bow down, be bowed down
  1) (Qal)
1a1. to be bowed down, be prostrated, be humbled
1a2. to bow (in homage)
1a3. to bow (of mourner)
1a4. to crouch (of wild beast in lair)
  2) (Niphal) to be prostrated, be humbled, be reduced, be
weakened, proceed humbly, be bowed down
  3) (Hiphil) to prostrate, lay low, bow down
  4) (Hithpolel) to be cast down, be despairing