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sit up
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Quick answer
As a verb, sit up means not go to bed. As a noun, it means a stomach exercise in which a person sits up from a supine position without using the arms for leverage.
Meanings of sit up
3 meaningsverb
Not go to bedbody
“Don't stay up so late — you have to go to work tomorrow”
“We sat up all night to watch the election”
Similar: stay upChange to an upright sitting position
“He sat up in bed”
noun
A stomach exercise in which a person sits up from a supine position without using the arms for leverage
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
verb: not go to bed
stay up