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English definition of “against”

against

preposition (IN OPPOSITION)   /əˈɡenst, əˈɡeɪnst/
in opposition to; opposed to: I know you’d like to get a more expensive car, but I’m against it. It’s against the law to throw your trash there (= It’s illegal). She voted against the tax increase. He warned them against repeating (= not to repeat) the mistakes of the former administration. Against also means in competition with: He would have to run against O’Toole for county treasurer. To go against something means to go in the opposite direction to it: swimming against the current
(Definition of against preposition (IN OPPOSITION) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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