fact of life noun
plural facts of life 1 [count] : something that exists and that cannot be changed or ignored
▪ For new parents, lack of sleep is just a fact of life. 2 the facts of life : the facts about sex that are told to children
▪ He explained the facts of life to his son.
▪ For new parents, lack of sleep is just a fact of life.
▪ He explained the facts of life to his son.
