against
Americanpreposition
-
in opposition to; contrary to; adverse or hostile to: against reason.
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.
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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.
-
The car is against the building.
conjunction
idioms
preposition
-
opposed to; in conflict or disagreement with
they fought against the legislation
-
standing or leaning beside or in front of
a ladder against the wall
-
coming in contact with
the branches of a tree brushed against the bus
-
in contrast to
silhouettes are outlines against a light background
-
having an adverse or unfavourable effect on
the economic system works against small independent companies
-
as a protection from or means of defence from the adverse effects of
a safeguard against contaminated water
-
in exchange for or in return for
-
rare in preparation for
he gave them warm clothing against their journey through the night
-
as opposed to or as compared with
he had two shots at him this time as against only one last time
Etymology
Origin of against
First recorded in 1125–75; Middle English agens, ageynes, equivalent to ageyn again + -es -s 1; for -t cf. whilst, amongst
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
On Aug. 13, Judge Richard Stearns dismissed the government’s separate Title VI suit against Harvard, and Ms. Van Erem drapes herself in that decision.
From The Wall Street Journal ● Aug. 23, 2026
But a late rescue act courtesy of a towering header from Guehi - who all the attention was on - and Josko Gvardiol's cool finish salvaged an unlikely comeback victory against Bournemouth.
From BBC ● Aug. 23, 2026
Independence High School was set to kick off its football season against Kern County rival Centennial High, but game night turned to tragedy.
From Los Angeles Times ● Aug. 23, 2026
Yet its campaign against the Bauhaus, arguably the state’s only global tourist draw, has left even its biggest supporters perplexed.
From The Wall Street Journal ● Aug. 23, 2026
You pop it into your mouth, the strawberry perfectly ripe, the bread melting against your tongue.
From "Legendary Frybread Drive-In" by Cynthia Leitich Smith
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.