sit up

Definitions of sit up
  1. verb
    change to an upright sitting position
    “He sat up in bed”
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    type of:
    change posture
    undergo a change in bodily posture
  2. verb
    not go to bed
    “We sat up all night to watch the election”
    synonyms: stay up
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    type of:
    wake
    be awake, be alert, be there
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