footloose and fancy-free
Having no attachments, especially romantic ones, and free to do as one pleases. For example, When I was in my twenties, footloose and fancy-free, I would travel at the drop of a hat. Both of these words have long been used separately; their pairing dates only from the 1900s.
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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.