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lay down the law

lay down the law idiom

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.

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.