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against

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preposition against pronunciation in American English /əˈɡenst/
  1. 1
    in opposition to someone/something
    1. a.
      used for stating which plan, idea, or action someone opposes and thinks is wrong

      Amnesty International has campaigned publicly against the death penalty.

      I'm against all forms of censorship.

    2. b.
      used for stating who or what you are trying to defeat in a game, race, or fight

      The Dodgers have won their last three games against the Cardinals.

      The king's son died in battle, fighting against the Persians.

      the fight against drugs in our city's schools

  2. 2
    touching or hitting someone/something
    1. a.
      touching or hitting the surface of something

      He leaned over and his lips brushed against her hair.

      I fell heavily against the bookshelves.

  3. 4
    directed toward or affecting someone/something in a negative way
    1. a.
      used for stating who is harmed or affected by something

      The dictator is charged with crimes against humanity.

      Police are investigating death threats made against a prosecution witness.

      illegal discrimination against minority employees

      count against (=cause someone to have a disadvantage):

      He's over 40, so his age may count against him.

    2. b.
      used for stating who someone dislikes or feels angry toward

      There was growing resentment among the people against their foreign rulers.

      turn against (=become unfriendly toward someone):

      Louis turned against his former ally, and withdrew his support.

    3. c.
      used for saying who is accused of doing something wrong
      accusation/charge/allegation against someone:

      Accusations of bribery had been made against the vice president.

      Police are expected to bring criminal charges against Warren.

  4. 5
    used for stating what is causing harm or affecting someone or something

    The plants must be protected against frost until late spring.

    All the children have been vaccinated against diseases such as polio.

  5. 6
    used for comparing one thing or amount with another

    This year's profits amounted to only $35 million, against $52 million last year.

    as against:

    Why is there a preference for the American system as against the British?

  6. 8
    if something appears against a background, it is seen with the background behind it

    The dark ruins of the castle stood out against the evening sky.

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