play (one's) heart out

play (one's) heart out

To exhibit maximum effort and enthusiasm while playing something, such as a sport, game, or instrument. Even though I played my heart out and scored two goals, we still lost the playoff game. You can tell the trumpet player is really feeling it—he's playing his heart out up there.
See also: heart, out, play
References in classic literature ?
In the first place, none of them should have any property of his own beyond what is absolutely necessary; neither should they have a private house or store closed against any one who has a mind to enter; their provisions should be only such as are required by trained warriors, who are men of temperance and courage; they should agree to receive from the citizens a fixed rate of pay, enough to meet the expenses of the year and no more; and they will go and live together like soldiers in a camp.