Give one's all

Near-synonym: give it one's best shot

"I'd go myself, if I was any use. As I ain't, I give my boys, and give 'em free." He spoke so cheerfully, looked so sincere, and seemed so glad to give his all, that I was ashamed of myself.

And it is well; her act being proportioned to the dignity of one who carries in her head and heart riches which outvalue any that any King could add, though he gave his all.

After swearing to support God and the Constitution, to give his all in any "war" against Catholics, Jews, Negroes, aliens and Communists, he paid $7 for a robe, 10¢ monthly dues, bought himself a gun, became a member in good standing.

[S]he was unique in not requiring rehearsals because she "gave her all the first time she tried a scene."

The Cemeterial Division . . . has taken up the huge task of establishing contact with the mothers or widows of the 30,000 American soldiers who gave their all and whose bodies rest in graves across the sea.

Police officers expressed shock at the news of their fellow officer's death. "He gave his all; he literally gave his all," said Officer Edward Looney.