sit-up

[ sit-uhp ]

/ ˈsɪtˌʌp /

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noun

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.

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Origin of sit-up

First recorded in 1835–45; noun use of verb phrase sit up

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use sit-up in a sentence

“I think for trans men who are dating every time they hook up they have another coming out,” Sandler said.
Grindr’s Trans Dating Problem|David Levesley|January 9, 2015|DAILY BEAST
In that photo, Merabet has a big smile that spreads across his whole face and lights up his eyes.
The Muslim Cop Killed by Terrorists|Michael Daly|January 9, 2015|DAILY BEAST
We won't find out this season, though it comes up occasionally.
‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS|Marlow Stern|January 8, 2015|DAILY BEAST
Kickstarter is one start-up platform that seems to have realized the danger.
Design Your Own Dinosaur: The Era of Custom DNA|Justin Jones|January 8, 2015|DAILY BEAST

The most recent issue contains detailed instructions for building car bombs, and the magazine frequently draws up hit-lists.
U.S. Spies See Al Qaeda Fingerprints on Paris Massacre|Shane Harris, Nancy A. Youssef|January 8, 2015|DAILY BEAST
What need to look to right or left when you are swallowing up free mile after mile of dizzying road?
The Joyous Adventures of Aristide Pujol|William J. Locke
Most of the men leaped up, caught hold of spears or knives, and rushed out.
The Giant of the North|R.M. Ballantyne
Some weeks after, the creditor chanced to be in Boston, and in walking up Tremont street, encountered his enterprising friend.
The Book of Anecdotes and Budget of Fun;|Various
In less than ten minutes, the bivouac was broken up, and our little army on the march.
Blackwood's Edinburgh Magazine, No. CCCXXXIX. January, 1844. Vol. LV.|Various
The bride elect rushes up to him, and so they both step down to the foot-lights.
Physiology of The Opera|John H. Swaby (AKA "Scrici")

British Dictionary definitions for sit-up

sit up

verb (adverb)

to raise (oneself or another) from a recumbent to an upright or alert sitting posture

(intr) to remain out of bed and awake, esp until a late hour

(intr) informal to become suddenly interested or alertdevaluation of the dollar made the money market sit up

noun sit-up

a physical exercise in which the body is brought into a sitting position from one lying on the backAlso: 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

Other Idioms and Phrases with sit-up

sit up

Rise to a sitting position from lying down, as in The sick child sat up and asked for a drink of water. [Early 1200s]

Stay up later than usual, as in The nurse sat up with her all night long. [Mid-1500s]

Sit with the spine erect, as in She was always telling the students to sit up. [Early 1700s]

Become suddenly alert, as in The students sat up when he brought up the test. The same sense appears in the related sit up and take notice, as in When he mentioned the arrival of a movie star, they all sat up and took notice. [Late 1800s]