Against adjective

From Longman Dictionary of Contemporary Englishagainsta‧gainst /əˈɡenst, əˈɡeɪnst $ əˈɡenst/ ●●●S1W1 preposition1a)AGAINST/OPPOSEused to say that someone opposes or disagrees with somethingEvery council member voted against the proposal.those who are campaigning against the new roadHe advised me against travelling.Mr Howard has declared that he is against all forms of racism.the fight against terrorismb)AGAINST/OPPOSEused to say that an action is not wanted or approved of by someoneThey got married against her parents’ wishes (=although they knew her parents did not want them to).She has been kept in the house against her will (=she does not want to stay in the house).The use of certain drugs is against the law (=illegal).It’s against my principles to borrow money (=I do not believe it is right).c)used to say that something is not allowed by a law or ruleThere ought to be a law against it.2AGAINST somebody IN A GAMEused to say who someone is competing with or trying to defeat in a game, battle etcGambotti was injured in last Saturday’s game against the Lions.We’ll be comp

is against a preposition word

is against a preposition or not