Definitions from Wiktionary (sit up)

▸ verb:  (intransitive) To assume a sitting position from a position lying down.
▸ verb:  (intransitive) To sit erect.
▸ verb:  (intransitive) To show sudden interest or surprise.
▸ verb:  (chiefly sports, of the ball) To bounce, especially to a comfortable height.
▸ verb:  To not go to bed (notionally remaining in a sitting position).
▸ verb:  (India, historical) For a young lady to open her house for several successive nights for any visitors who wish to pay their respects.
▸ noun:  Alternative spelling of sit-up [An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position.]
▸ Also see sit_up

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