Brown Driver Briggs

 1. sheol, underworld, grave, hell, pit
  1) the underworld
  2) Sheol - the OT designation for the abode of the dead
1b1. place of no return
1b2. without praise of God
1b3. wicked sent there for punishment
1b4. righteous not abandoned to it
1b5. of the place of exile (fig)
1b6. of extreme degradation in sin