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Everyone treasures their life.
Literal
Life [topic-は] anyone [even-でも] precious.
誰でも = 'anyone / anybody,' part of the でも-set (いつでも, どこでも, 何でも). 惜しい is an い-adjective meaning 'regrettable to lose, precious, dear' — used here to say life is the one thing no one willingly gives up. A compact philosophical observation.