The difference between Sit down and Sit up
When used as verbs, sit down means to assume a sitting position from a standing position, whereas sit up means to assume a sitting position from a position lying down.
check bellow for the other definitions of Sit down and Sit up
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Sit down as a verb (intransitive):
To assume a sitting position from a standing position.
Examples:
"Sit down! We have work to do."
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Sit down as a verb (transitive, _, or, _, reflexive):
To cause to be seated or in a sitting posture; to furnish a seat to.
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Sit down as a verb (figurative):
To meet formally at a conference table.
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Sit down as a verb:
To assume a low or sunken position.
Examples:
"The ball scooted off the fairway and sat down in the thick rough."
"As we all climbed aboard, the little boat sat down low in the water."
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Sit up as a verb (intransitive):
To assume a sitting position from a position lying down.
Examples:
"Despite being sick, Lorin sat up to greet the visitors."
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Sit up as a verb (intransitive):
To sit erect.
Examples:
"Sit up straight, mister!"
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Sit up as a verb (intransitive):
To show sudden interest or surprise.
Examples:
"He sat up when we mentioned the increased pay package."
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Sit up as a verb (chiefly, sport, of the ball):
To bounce, especially to a comfortable height.
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Sit up as a verb:
To not go to bed (notionally remaining in a sitting position).
Examples:
"I sat up all night waiting for her to come home."
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Sit up as a noun:
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