A game

American  

Or A-game,

noun

Informal.

1. a person’s best effort, abilities, or achievement.

   The candidate brought her A game to the debate.

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'A' game British  

noun

1. informal one's best possible performance, esp in the phrase to bring or take one's 'A' game

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Etymology

Origin of A game

In reference to a sports contest, with the letter A indicating peak performance

Example Sentences

The tribes contend the slot-machine-like machines are a game of chance and under its purview.

From Los Angeles Times

Santa Anita says because the mutuel pool is not held in-house but between bettors that it is a game of skill and allowed.

From Los Angeles Times

At the same time, its digital incarnation can be a laboratory for high-octane bets—and make placing trades on an app seem even more like a game.

From The Wall Street Journal

A similar opinion urging the Lakers to trade Reaves appeared in this column last summer, but that was written before Reaves had a breakout start this season, averaging 27 points a game on 51% shooting before being sidelined with a calf injury.

From Los Angeles Times

Mevis and the Rams special teams are expected to play a key role in the matchup between the No. 2-seeded Bears and the No. 5 Rams in a game that could be played with temperatures in the teens and a wind-chill of less than zero degrees.

From Los Angeles Times