crack down
American Heritage Dictionary of Idioms:
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crack down
Act more forcefully to regulate, repress, or restrain. For example, The police cracked down on speeding. [1930s]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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