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1. (n.) sit-up
an exercise in which a person lies flat on the back, lifts the torso to a sitting position, and then lies flat again without changing the position of the legs: formerly done with the legs straight but now usu. done with the knees bent.
Etymology: (1835–45)
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| Definition of 'sit-up' |
Princeton's WordNet |
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1. (verb) sit-up
a stomach exercise in which a person sits up from a supine position without using the arms for leverage
2. (verb) stay up, sit up
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"
3. (verb) sit up
change to an upright sitting position
"He sat up in bed"
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Definitions of sit-up 
