A number 1
a number one
Of the very highest caliber, standard, or quality. That was a number one performance last night.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
A number 1verb
See also: number
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.