cap it all

cap it all idiom
  1. Also, cap it all off. Finish or complete something, as in To cap it all off they served three kinds of dessert.
  2. 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® 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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