at one's best
In one's most excellent state or condition. For example, The photographer tried hard to show the bride at her best. [1500s]
Why The Turducken Is One Of The Best Word Plays Of All TimeIt's Thanksgiving time, and while some folks will be piling their plates with turkey and mashed potatoes, we can't pass on the opportunity to consider a dish named with one of the greatest portmanteaus of all time: the turducken.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.