Definition of against preposition from the Oxford Advanced American Dictionary

Oxford3000

against

preposition
/əˈɡɛnst/
 
 
help For the special uses of against in phrasal verbs, look at the entries for the verbs. For example, count against someone is in the phrasal verb section at count.1 opposing or disagreeing with someone or somethingthe fight against terrorismWe're playing against the league champions next week.We were rowing against the current.That's against the law.She was forced to marry against her will.Are you for or against the death penalty?She is against seeing (= does not want to see) him.I'd advise you against doing that.2 not to the advantage or favor of someone or somethingThe evidence is against him.Her age is against her. compare for3 close to, touching, or hitting someone or somethingPut the piano there, against the wall.The rain beat against the windows.4 in order to prevent something from happening or to reduce the damage caused by somethinga vaccination against the measlesThey took precautions against fire.Are we insured against theft?5 with something in the background, as a contrastHis red clothes stood out clearly against the snow.(figurative)The love story unfolds against a background of civil war.6 used when you are comparing two thingsYou must weigh the benefits against the cost.Check your receipts against the statement.What's the exchange rate against the euro?IDIOMS

as against something

in contrast with something
They got 27% of the vote, as against 32% at the last election.as against

the cards/odds are stacked against you

you are unlikely to succeed because the conditions are not good for you
the cards are stacked against youthe odds are stacked against you