Meaning of “sit up” in the English Dictionary

american-english dictionary
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"sit up" in British English

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sit-upnoun [ C ]

uk /ˈsɪt.ʌp/ us /ˈsɪt̬.ʌp/

a type of exercise in which someone sits up from a lying position, designed to make the abdominal muscles stronger

(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

(STRAIGHTEN)

to straighten your body or move into a sitting position:

She was finally strong enough to sit up in bed.

sit up

phrasal verb with sit us /sɪt/ verb

(STAY AWAKE)

to stay awake 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 strengthens your stomach muscles, in which you lie down and lift yourself into a sitting position without using your arms

(Definition of “sit up” from the Cambridge Academic Content Dictionary © Cambridge University Press)