in opposition to; contrary to; adverse or hostile to

twenty votes against ten; against reason.

in resistance to or defense from

protection against burglars.

in an opposite direction to

to ride against the wind.

into contact or collision with; toward; upon

The rain beat against the window.

in contact with

to lean against the wall.

in preparation for; in provision for

money saved against a rainy day.

having as background

a design of flowers against a dark wall.

in exchange for; as a balance to or debit or charge on

He asked for an advance against his salary.

in competition with

a racehorse running against his own record time.

in comparison or contrast with

a matter of reason as against emotion.

beside; near; before

The car is against the building.

Archaic . before; by the time that. ?

over against

in contrast with

the rich over against the poor.

preposition

across , adjacent , contra , contrary to , counter to , facing , in contrast to , in opposition to , opposed to , opposing , versus , anti , beside , concerning , from , into , near , opposed , opposite , respecting , touching , upon