drop off

• n.
  • a noticeable deterioration in performance or quality

    同义词： slump slack drop-off falloff falling off

  • a steep high face of rock

    同义词： cliff drop drop-off

  • a change downward

    同义词： decrease lessening drop-off

• v.
  • fall or diminish
  • change from a waking to a sleeping state

    同义词： fall asleep dope off flake out drift off nod off doze off drowse off

  • leave or unload, especially of passengers or cargo

    同义词： drop set down put down unload discharge

  • retreat

    同义词： fall back lose fall behind recede

  • get worse

    同义词： slip drop away fall away

以上来源于: WordNet