Bring your A game American spoken informal Written language
This idiom is expressed in athletics in particular.
To do one's best or try one's best to do something
If you bring your A game in the swimming competition, I will give you a special present, my son.
We must grasp this chance. Bring our A game or we'll have nothing.
Everyone in the team needs to bring his A game as the opponent is strong.
Adequate measures or actions
If someone is going through a purple patch, that means they have a very successful or lucky period, especially in sports.
A spectator at a sporting event boos at a specific competitor after something they didn't like happen.
If you desire something good or appealing, you must make the necessary effort to acquire it.
'A' should be capitalized. The verb "bring" should be conjugated according to its tense.
In the middle 20th Century, American English about 1969, an article about a golf course in Hilton Head South Carolina appeared in Gentleman's Quarterly. The course was considered to be very difficult and playing it required one to "bring her/his A game." This was the first recorded use of the phrase, so we can assume that for at least 20 years before it was around orally.