sit up

Verb
  1. Not go to bed (synset 200020252)
    "Don't stay up so late--you have to go to work tomorrow"; "We sat up all night to watch the election"
    is a type of: wake - be awake, be alert, be there
    same as: stay up
  2. Change to an upright sitting position (synset 202102958)
    "He sat up in bed"
    is a type of: change posture - undergo a change in bodily posture

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