sit-up - meaning and definition. What is sit-up
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What (who) is sit-up - definition

ABDOMINAL ENDURANCE TRAINING EXERCISE TO STRENGTHEN AND TONE THE ABDOMINAL MUSCLES
Sit up; Sit ups; Situp; Situps; Sit-ups; Sit-up (exercise)

sit up         
1. move from a lying or slouching to a sitting position.
2. refrain from going to bed until later than usual.
sit up         
1.
If you sit up, you move into a sitting position when you have been leaning back or lying down.
Her head spins dizzily as soon as she sits up.
PHRASAL VERB: V P
2.
If you sit someone up, you move them into a sitting position when they have been leaning back or lying down.
She sat him up and made him comfortable.
PHRASAL VERB: V n P
3.
If you sit up, you do not go to bed although it is very late.
We sat up drinking and talking...
= stay up
PHRASAL VERB: V P
4.
see also sit-up
sit-up         
¦ noun a physical exercise designed to strengthen the abdominal muscles, in which a person sits up from a supine position without using the arms for leverage.

Wikipedia

Sit-up

The sit-up (or curl-up) is an abdominal endurance training exercise to strengthen, tighten and tone the abdominal muscles. It is similar to a crunch (crunches target the rectus abdominis and also work the external and internal obliques), but sit-ups have a fuller range of motion and condition additional muscles.

Examples of use of sit-up
1. After all, it is only when the public sit up, and sit in, that the government will be forced to sit up and take notice too.
2. Two times, Katut struggled to sit up but fell over.
3. So please just sit up straight and sharpen your pencils.
4. "Wendell Woodward McLeod Jr." Annette tells him to sit up.
5. I had to sit up for hours when all I wanted to do was lie down.