set against

set against idiom
Be or cause someone to be opposed to, as in Civil wars often set brother against brother, or The police chief's critics were set against his officers. [Late 1200s] Also see dead set against.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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