knock

knock idiom
In addition to the idioms beginning with knock, also see beat (knock) into someone's head; beat (knock) the living daylights out of; (knock) down to size; (knock) off someone's feet; school of hard knocks.

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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knock yourself out115 years ago
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