Brown Driver Briggs

 1. to sink, relax, sink down, let drop, be disheartened
  1) (Qal)
1a1. to sink down
1a2. to sink, drop
1a3. to sink, relax, abate
1a4. to relax, withdraw
  2) (Niphal) idle (participle)
  3) (Piel) to let drop
  4) (Hiphil)
1d1. to let drop, abandon, relax, refrain, forsake
1d2. to let go
1d3. to refrain, let alone
1d4. to be quiet
  5) (Hithpael) to show oneself slack