on the fly
In a hurry, on the run, as in I picked up some groceries on the fly. The transfer of this expression, which literally means “in midair or in flight,” dates from the mid-1800s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use on the fly in a sentence
We shoot in Brooklyn, and I live in Brooklyn, so I sort of do a lot of on-the-fly street-style research.
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