once upon a time

once upon a time idiom
On some past occasion, as in I may have sung this piece once upon a time, but I don't really remember it. This phrase, first recorded in 1595, is frequently used as the opening line of fairy tales and stories told to children, as in Once upon a time there was a king who had three beautiful daughters.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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