sit up Meaning in the Cambridge English Dictionary
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Meaning of “sit up” in the English Dictionary

"sit up" in British English

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sit up

phrasal verb with sit uk   us   /sɪt/ verb (present participle sitting, past tense and past participle sat)

sit up (STRAIGHT)

to ​sit with a ​straight back: How many ​times do I have to ​tell you to ​sit up straight?

sit up (STAY AWAKE)

to ​stayawake and not go to ​bedalthough it is late: [+ -ing verb] The ​book was so ​interesting that I ​sat up all ​nightreading it. I'll be late ​tonight, so don't ​sit up for (= ​wait for) me.

sit up (NOTICE)

informal to show ​interest or ​surprise: The ​news that he was getting ​married really made her ​sit up.

sit-upnoun [C]

uk   /ˈsɪt.ʌp/  us   /ˈsɪt̬-/
a ​type of ​exercise in which someone ​sits up from a ​lyingposition, ​designed to make the abdominalmusclesstronger
(Definition of sit up from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sit up" in American English

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sit up

phrasal verb with sit  us   /sɪt/ verb

sit up (STRAIGHTEN)

to ​straightenyourbody or move into a sitting ​position: She was ​finallystrong enough to sit up in ​bed.

sit up

phrasal verb with sit  us   /sɪt/ verb

sit up (STAY AWAKE)

to ​stayawake late, esp. past the ​time that you usually go to ​bed: We sat up ​talking until 2 a.m.

sit-upnoun [C]

 /ˈsɪt̬ˌʌp/
an ​exercise that ​strengthensyourstomachmuscles, in which you ​lie down and ​lift yourself into a ​sittingposition without using ​yourarms
(Definition of sit up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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