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[sit-uhp] /ˈsɪtˌʌp/
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 of sit-up
1835-45; noun use of verb phrase sit up Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sit-up
Historical Examples
  • It seemed as if the very rabbits must come and sit-up there, the jays and pigeons settle above; everything in all the wood gather.

    Tatterdemalion John Galsworthy
Word Origin and History for sit-up

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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