Sit up

Pro Tip 1/3

Physical Motion

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

I sat up when the alarm clock rang.

Pro Tip 2/3

Surprise Trigger

Typically used when something unexpected prompts you to rise.

She sat up immediately after hearing the thunder.

Pro Tip 3/3

Not Just Beds

While common with beds, it also applies to other surfaces like floors or grass.

He sat up on the picnic blanket.