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Phrase(s): An apple a day keeps the doctor away.
Prov. Apples are so nutritious that if you eat an apple every day, you will not ever need to go to a doctor. • Remember to take an apple in your lunch today. An apple a day keeps the doctor away. • Grandma always fed us lots of apples when we visited her. She believed that an apple a day keeps the doctor away.
McGrawhill's American Idioms And Phrasal Verbs