give one's all

verb2

1. •
   To make the utmost effort; to contribute, using all of one's abilities and resources.

   • "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. — 1868
2. •
   (euphemistic) To lose one's life while making the utmost effort with full commitment.

   • 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. — 2005