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polarize (one group of people) into (two groups of people)
To cause a group of people to divide into two opposing or contrasting groups. The issue has polarized the country into two bitterly divided camps—those in favor of the legislation, and those against it. The controversial CEO tends to polarize employees into a group that loves him and a group that hates him.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
polarize something into something
to divide a group into two segments. Your actions have just polarized the students into two opposing groups! We polarized the entire population into two factions.
See also: polarize
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.