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clamp down on

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Also, put the clamps on. Become stricter or more repressive; put a stop to. For example, The company was clamping down on expenses like business lunches, or It's time we put the clamps on polluters. [Mid-1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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