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English definition of “against”

against

preposition (TOUCHING)    /əˈɡenst/ /-ˈɡeɪnst/ US  /-ˈɡenst/
A2 next to and touching or being supported by (something): Why don't we put the bed against the wall ? He loved the feel of her soft hair against his skin . The rain beat against her face as she struggled through the wind . The police officer had him up against the wall , both arms behind his back. She leaned against the door .Next to and beside in front of or compared to: Paintings look best against a simple white wall .Comparing and contrasting Grammar:Against: reactionsWe use against to refer to negative, hostile or opposing reactions to situations, beliefs, people, events, etc.Grammar:Against: physical contactWe often use against to talk about physical contact between two or more things:Grammar:Against: competitionWe often use against with verbs and nouns connected with sport and competitions, such as compete/competition, final, game, match, play, semi-final:Grammar:When we don’t use againstWe use about, not against, to refer to taking action to solve problems:Grammar:Against: typical errorGrammar:AgainstAgainst is a preposition.
(Definition of against preposition (TOUCHING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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