D defs.my
Entry 3 senses Webster, 1913

drop-off

· IPA /drˈɑpˌɔf/
01 n. a noticeable decline in performance; as, a drop-off in attendance.
  1. 1.
    a noticeable decline in performance; as, a drop-off in attendance.
  2. 2.
    a steep high face of rock.
  3. 3.
    a change downward; as, there was a sharp drop-off in sales.
Syn. slump, falloff, falling off. — Syn. -- cliff. — Syn. -- decrease, lessening.