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have a nice day

Also, have a good day; have a good one. A cordial goodbye to you. For example, Thanks for the order, have a nice day, or See you next week—have a good day, or The car's ready for you—have a good one. These expressions have become synonymous with a polite farewell. The first originated about 1920 but, like the variants, became widespread only after 1950.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.