Sit up
phrasal verb
To move your body into a sitting position from a lying position.
He sat up in bed when he heard the noise.

Often appears as...
- sit up in bed
- sit up straight
phrasal verb
To become alert or pay attention.
The mention of a bonus made everyone sit up.

Often appears as...
- sit up and take notice
- sit up and listen
phrasal verb
A form of exercise involving the raising of the body to a sitting position.
She does 50 sit ups every morning to stay fit.

Often appears as...
- do sit ups
- start with sit ups
phrasal verb
To move your body into a sitting position from a lying position.
He sat up in bed when he heard the noise.

Often appears as...
- sit up in bed
- sit up straight
phrasal verb
To become alert or pay attention.
The mention of a bonus made everyone sit up.

Often appears as...
- sit up and take notice
- sit up and listen
phrasal verb
A form of exercise involving the raising of the body to a sitting position.
She does 50 sit ups every morning to stay fit.

Often appears as...
- do sit ups
- start with sit ups
Definition 1 of 3

Physical Motion
Often describes waking up or reacting to something while lying down.

I sat up when the alarm clock rang.
Surprise Trigger
Typically used when something unexpected prompts you to rise.

She sat up immediately after hearing the thunder.
Not Just Beds
While common with beds, it also applies to other surfaces like floors or grass.

He sat up on the picnic blanket.
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