Definition & Meaning of "[live] and [breathe] {sth}"

What is the origin of the idiom "live and breathe something" and when to use it?

The idiom "live and breathe something" finds its origin in the innate connection between the basic functions of life and one's strong devotion or dedication to a particular interest or pursuit. It is a figurative expression that draws upon the essential activities of living and breathing to convey the profound significance and influence that the mentioned subject holds in a person's life. It is a commonly used idiom that indicates an individual's unwavering commitment, enthusiasm, or involvement in a specific area of their life. It conveys the idea that the person's entire existence revolves around the mentioned subject, and they are deeply engaged and invested in it.