The difference between Sit up and Stand up
When used as verbs, sit up means to assume a sitting position from a position lying down, whereas stand up means to rise from a lying or sitting position.
check bellow for the other definitions of Sit up and Stand up
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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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Stand up as a verb (intransitive):
To rise from a lying or sitting position.
Examples:
"Stand up, then sit down again."
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Stand up as a verb (transitive):
To bring something up and set it into a standing position.
Examples:
"Laura stood the sofa up on end."
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Stand up as a verb (transitive, idiomatic):
(stand someone up) To avoid a prearranged meeting, especially a date, with (a person) without prior notification; to jilt or shirk.
Examples:
"John stood Laura up at the movie theater."
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Stand up as a verb (intransitive, of a thing):
To last or endure over a period of time.
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Stand up as a verb (intransitive, of a person or narrative):
To continue to be believable, consistent, or plausible.
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Stand up as a verb (intransitive, cricket, of a wicket-keeper):
To stand immediately behind the wicket so as to catch balls from a slow or spin bowler, and to attempt to stump the batsman.
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Stand up as a verb (transitive):
To launch, propel upwards
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Stand up as a verb (US, military, transitive):
To formally activate and commission (a unit, formation, etc.).