From Longman Dictionary of Contemporary Englishbe somebody’s (whole) lifebe somebody’s (whole) lifeIMPORTANTto be the most important thing or person to someone Music is Laura’s whole life. → life
Examples from the Corpus
be somebody’s (whole) life• With the one the bird is risking its life, with the other only a meal.• That, she said later, was how life baited the trap.• His praying likewise was full of life and feeling.• Music is Laura's life.• When this relationship is extended, life on land becomes equated not only with non-questing but with spiritual non-being.• The hard-edged Luce style was making Life a more serious product than its old-fashioned competitor.• A life that isn't exactly life. 