He lived life to the fullest.
Meaning: He made the most of every opportunity and enjoyed his life as much as he could.
Choice of Words: Lived is the past tense of live, which means to be alive. Life refers to the existence of an individual human being or animal. Fullest means to the greatest extent possible. When you put them together, the sentence suggests that he made the most of his life and experienced it to the fullest.
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