Etymology: Middle English, alteration of againes, from again
Date: 13th century
1 a: in opposition or hostility to <spoke against his enemies>b: contrary to <against the law>c: in competition with <racing against each other>d: as a basis for disapproval of <had nothing against him> 2 a: directly opposite :facing<she sat down just over against me — Daniel Defoe>bobsolete: exposed to 3: compared or contrasted with <profits are up against last year> 4 a: in preparation or provision for <saving against an uncertain future>b: as a defense or protection from <a shelter against the cold> 5 a: in the direction of and into contact with <knocked against the ropes>b: in contact with <leaning against the wall> 6: in a direction opposite to the motion or course of : counter to <sail against the wind> 7 a: as a counterbalance to <weighing risk against profit>b: in exchange for <a lower rate against the dollar>c: as a charge on <charged against her account> 8: before the background of <viewed against the sky>