drop off

Verb
  1. Fall or diminish (synset 200152707)
    "The number of students in this course dropped off after the first test"
  2. Change from a waking to a sleeping state (synset 200017275)
    "he always falls asleep during lectures"
  3. Remove (cargo, people, etc.) from and leave (synset 201492094)
    "unload the cargo"; "drop off the passengers at the hotel"
  4. Retreat (synset 201116231)
  5. Get worse (synset 200204753)
    "My grades are slipping"

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