lay down the law


Assert something positively and often arrogantly, state something dogmatically. For example, Dad laid down the law about locking up the house. This colloquial expression, first recorded in 1762, uses lay down in the sense of def. 2.

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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.