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cap it all

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Also, cap it all off. Finish or complete something, as in To cap it all off they served three kinds of dessert.
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Surpass or outdo something, as in This last story of Henry's caps them all. Both usages employ cap in the sense of “topping” something. [ First half of 1800s ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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