A game

or A-game, a-game


noun Informal.

a person’s best effort, abilities, or achievement: The candidate brought her A game to the debate.

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Origin of A game

in reference to a sports contest, with the letter A indicating peak performance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for A game

'A' game

noun

mainly US and Canadian informal one's best possible performance, esp in the phrase to bring or take one's 'A' game
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012