Dictionary

1against

preposition \ə-ˈgen(t)st, -ˈgin(t)st, -ˈgān(t)st\

: in opposition to (someone or something)

: in competition with (someone or something)

—used to indicate the person or thing that is affected or harmed by something

Full Definition of AGAINST

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>
b obsolete :  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>
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Origin of AGAINST

Middle English, alteration of againes, from again
First Known Use: 13th century

Related to AGAINST

Synonyms
on, upon
Antonyms
for, pro

2against

conjunction

Definition of AGAINST

archaic
:  in preparation for the time when <throw on another log of wood against father comes home — Charles Dickens>

First Known Use of AGAINST

14th century
AGAINST Defined for Kids

against

preposition \ə-ˈgenst\

Definition of AGAINST for Kids

1
:  opposed to <Everyone was against her idea.>
2
:  not agreeing with or allowed by <against the law>
3
:  as protection from <We built a shelter against the cold.>
4
:  in or into contact with <The ball bounced against the wall.>
5
:  in a direction opposite to <against the wind>
6
:  before the background of <green trees against a blue sky>

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