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English definition of “against”

against

preposition  /əˈɡenst, əˈɡeɪnst/ us  

against preposition (IN OPPOSITION)

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

against preposition (DIRECTED AT)

directed at or toward: Among the charges leveled against them were bribery and tax evasion. There's a process for filing claims against the city. Note: Used about something negative.

against preposition (TOUCHING)

next to and touching or being supported by something: It would save space if we put the bed against the wall. He leaned his head against the back of his chair.
(Definition of against from the Cambridge Academic Content Dictionary © Cambridge University Press)
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