From Longman Dictionary of Contemporary Englishthe light of somebody’s lifethe light of somebody’s lifethe person that someone loves more than anyone else Her son was the light of her life. → light
Examples from the Corpus
the light of somebody’s life• Ixora was his only child, the light of his life.• We have a four-year-old son who is the light of my life.• His wife, while sound in mind, had taken a pillow and had deliberately snuffed out the light of his life.• LoEshe was the light of his life. 