free as a bird

At liberty, without obligations, as in Can you join us tonight?—Yes, I'm free as a bird, or He's free as a bird—he can travel wherever he chooses. [c. 1700]. Also see footloose and fancy-free.

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