apple a day

Idioms & Phrases

apple a day

A small preventive treatment wards off serious problems, as in He exercises regularlyan apple a day is his motto. This idiom shortens the proverb An apple a day keeps the doctor away, first cited about 1630.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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