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Verb: sit up
  1. Not go to bed
    "We sat up all night to watch the election";
    - stay up
  2. Change to an upright sitting position
    "He sat up in bed"
Noun: sit-up  sit úp
  1. A stomach exercise in which a person sits up from a supine position without using the arms for leverage

Derived forms: sat up, sits up, sitting up, sit-ups

Type of: change posture, stomach exercise, tummy crunch, wake

Encyclopedia: Sit up