preposition

 

not agree disagreeing with a plan or activity

Andrew wants to change offices but I'm against it.

 

compete competing with or opposing someone or something

Liverpool is playing against AC Milan.

 

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.