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Phrase(s): Bread is the staff of life.
Prov. Food is necessary for people to survive. • Miranda likes to give money to charities that feed people. "Other services are important," she reasons, "but bread is the staff of life." • Jill: Want to go to lunch with us, Bob? Bob: No. I must work on my novel while inspiration lasts. Jill: Don’t forget to eat. Bread is the staff of life, you know.
McGrawhill's American Idioms And Phrasal Verbs