What does sit up mean?

Looking for the meaning or definition of the word sit up? Here's what it means.

Verb
  1. (intransitive) To assume a sitting position from a position lying down.
  2. (intransitive) To sit erect.
  3. (intransitive) To show sudden interest or surprise.
  4. (chiefly sports, of the ball) To bounce, especially to a comfortable height.
  5. To not go to bed (notionally remaining in a sitting position).
Noun
  1. Alternative spelling of sit-up; alternative spelling of situp
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