sit up

Học thuật
Thân thiện
Definition
  1. Verb (intransitive):
    • To move from a lying or reclining position to a seated position with the back straight.
    • To remain awake and out of bed later than the usual time, especially for a specific purpose.
Usage and Examples
  • Verb (intransitive):
    • When the alarm rang, she sat up quickly. (She moved from lying down to sitting.)
    • The patient is now strong enough to sit up in a chair. (The patient can move to an upright seated position.)
    • We sat up all night talking. (We stayed awake and did not go to bed all night.)
    • I had to sit up late to finish my report. (I had to stay awake working until late.)
Advanced Usage and Nuances
  • "Sit up and take notice": To suddenly start paying close attention because something is surprising or important.
    • The company's innovative product made the whole industry sit up and take notice.
  • The phrase often implies a deliberate action, either physical (changing posture) or mental (choosing to stay awake).
Variants and Related Words
  • Sit-up (noun): A physical exercise in which a person lies on their back and rises to a sitting position.
    • She does fifty sit-ups every morning.
  • Stay up: A near synonym for the "remain awake" meaning.
    • The children were allowed to stay up to see the fireworks.
Synonyms
  • For "change position": Rise, straighten up.
  • For "not go to bed": Stay up, keep vigil, burn the midnight oil.
Related Phrasal Verbs
  • Sit up for (someone): To stay awake waiting for someone to arrive.
    • My mother always sits up for me when I come home late.
  • Sit up with (someone): To stay awake at night to care for or keep company with someone.
    • He sat up with his sick child all night.
Related Idioms
  • Make someone sit up: To surprise or impress someone greatly, causing them to pay attention.
    • His shocking revelation really made the committee sit up.
Verb
  1. change to an upright sitting position
    • He sat up in bed
  2. not go to bed
    • Don't stay up so late--you have to go to work tomorrow
    • We sat up all night to watch the election

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