crack down

crack down idiom
Act more forcefully to regulate, repress, or restrain. For example, The police cracked down on speeding. [1930s]

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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