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 Also note that there are examples where "up to" can even mean "excluding" imagine you're doing a mathematical problem in which you are required to find the value of X, but all you can work out is X=1, then you can say I have found that, up to a sign, the result is 1 Cheers Share Improve this answer Follow answered Feb 27 '16 at 248Definition and synonyms of up from the online English dictionary from Macmillan Education This is the British English definition of upView American English definition of up Change your default dictionary to American English View the pronunciation for upSomething is up if something is up, someone is feeling unhappy because they have problems, or there is something wrong in a situation I could tell by the look on his face that something was up something is up with Is something up with Julie? Give Up Phrasal Verb Meanings And Examples Woodward English What are you been up to meaning