NOT AGREE › disagreeing with a plan or activity: Andrew wants to change offices but I'm against it. There were 70 votes for the new proposal and 30 against.
COMPETE › competing with or opposing someone or something: Liverpool is playing against AC Milan. the fight against racism
TOUCH › touching something: Push the bed against the wall.
PROTECT › protecting you from something bad: Fresh fruit in the diet may protect against cancer.
OPPOSITE DIRECTION › in the opposite direction to the way something is moving: I was cycling against the wind.
against the law/the rules › forbidden by a law or by rules: It's against the law to leave young children alone in the house.
against sb's advice/wishes, etc › If you do something against someone's advice, wishes, etc, you do it although they have said you should not or must not: He flew there against his doctor's advice.
have sth against sb/sth › to have a reason not to like someone or something: I've got nothing against him personally, I just don't think he's the right man for the job.