sit-up

1 of 2

noun

ˈsit-ˌəp 

: 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

sit up

2 of 2

verb

sat up; sitting up; sits up

intransitive verb

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

Noun

This sit-up variation of a Russian twist strengthens rotational core movement and improves your ability to generate power from the core. —Health Editorial Team, Health, 2 June 2024

The singer lifted weights on a sit-up bench with his spotter, also cooly rocking sunglasses indoors. —Taijuan Moorman, USA TODAY, 12 Apr. 2024

Verb

For a sit-in at a lunch counter, they were told, sit up straight, be courteous and don’t strike back. —Robert D. McFadden, New York Times, 10 June 2024

Babies can use the play gym on their back or stomachs (during tummy time) or while sitting up. —Ashley Ziegler, Parents, 8 June 2024

Word History

First Known Use

Noun

1900, in the meaning defined above

Verb

13th century, in the meaning defined at sense 1a

Kids Definition

sit-up

noun

ˈsit-ˌəp

: an exercise done by lying on the back and rising up to a sitting position by bending forward at the waist without lifting the feet and returning to the original position