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English definition of “up to”

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up to

adverb  /ˈʌp tu, / us  
less than or equal to, but not more than, a stated value, number, level, or time: Research suggests that up to half of those who were prescribed the drug suffered side effects. You have up to ten minutes.

up to

preposition  /ˈʌp tu, / us  

up to preposition (RESPONSIBILITY)

being the responsibility of (someone): The decision is up to you. If it were up to me, I’d do it.

up to preposition (DOING)

doing (something that might be bad or illegal), often secretly: When it’s so quiet, I think the kids are up to something.
Translations of “up to”
in Chinese (Traditional) 接近於, 至多…
in Chinese (Simplified) 接近于, 至多…
(Definition of up to from the Cambridge Academic Content Dictionary © Cambridge University Press)
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