drop-off [ 'drɔpɔf ]

• n.
  • a noticeable deterioration in performance or quality

    "a drop-off in attendance"

    同义词： slump slack falloff falling off

  • a steep high face of rock

    同义词： cliff drop

  • a change downward

    "there was a sharp drop-off in sales"

    同义词： decrease lessening

• v.
  • fall or diminish

    同义词： drop off

  • change from a waking to a sleeping state

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

  • leave or unload, especially of passengers or cargo

    同义词： drop drop off set down put down unload discharge

  • retreat

    同义词： fall back lose drop off fall behind recede

  • get worse

    同义词： slip drop off drop away fall away

以上来源于: WordNet