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sit-up

[sit-uhp] /ˈsɪtˌʌp/
noun
1.
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 usually done with the knees bent.
Origin
1835-1845
1835-45; noun use of verb phrase sit up
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sit-up

sit up

verb (adverb)
1.
to raise (oneself or another) from a recumbent to an upright or alert sitting posture
2.
(intransitive) to remain out of bed and awake, esp until a late hour
3.
(intransitive) (informal) to become suddenly interested or alert: devaluation of the dollar made the money market sit up
noun
4.
a physical exercise in which the body is brought into a sitting position from one lying on the back Also trunk curl
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sit-up
n.

also situp, kind of physical exercise, 1955, from the verbal phrase (attested from early 13c.); see sit (v.) + up (adv.). Related: Sit-ups.

Online Etymology Dictionary, © 2010 Douglas Harper
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3
3
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