: a conditioning exercise performed from a supine position by raising the torso to a sitting position and returning to the original position without using the arms or lifting the feet
sat up; sitting up; sits up
1
a
: to rise from a lying to a sitting position
b
: to sit with the back erect
2
: to show interest, alertness, or surprise
sit up and take notice
3
: to stay up after the usual time for going to bed
Examples of sit-up in a Sentence
Recent Examples on the Web
Bruce Y. Lee, Forbes, 6 Nov. 2024
During sit-ups, engage your core and complete reps slowly and with control.
—Jakob Roze, Health, 22 Oct. 2024
Jordan Greene, People.com, 30 Oct. 2024
Toys for Gross Motor Skill Development From rolling over and crawling to sitting up and walking, your infant is on their way to developing a wide variety of gross motor skills.
—Laura Lu, Ms, Parents, 24 Oct. 2024
See all Example Sentences for sit-up 
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Noun
The British Heart Foundation has a 10-minute workout from their physical activity specialist Lisa Young that consists of sit-ups, squats, jumping jacks, punches and high knees.
—Bruce Y. Lee, Forbes, 6 Nov. 2024
During sit-ups, engage your core and complete reps slowly and with control.
—Jakob Roze, Health, 22 Oct. 2024
Verb
According to the Cleveland Clinic, POTS is a chronic condition that causes an abnormally large increase in heart rate when standing or sitting up, which often leads to fainting episodes that typically last about 10 seconds.
—Jordan Greene, People.com, 30 Oct. 2024
Toys for Gross Motor Skill Development From rolling over and crawling to sitting up and walking, your infant is on their way to developing a wide variety of gross motor skills.
—Laura Lu, Ms, Parents, 24 Oct. 2024
See all Example Sentences for sit-up
Dictionary Entries Near sit-up
Cite this Entry
“Sit-up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sit-up. Accessed 28 Nov. 2024.
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