on the fly

Idioms  

1. 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.

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Example Sentences

They expertly steer the story around one sharp turn after another, with many a secret exposed and the principals adjusting their outlooks on the fly.

From The Wall Street Journal • Apr. 9, 2026

The Show was created on the fly, based around a drum loop and the theme song to kids' TV show Inspector Gadget.

From BBC • Mar. 25, 2026

The software company borrowers that fill OTF’s portfolio are exactly the sort of companies that now worry investors, as new artificial intelligence tools promise to let users create their own software on the fly.

From Barron's • Mar. 17, 2026

With its more expansive layout, open entrances, and large concourses, it can pose particular problems by forcing players to adjust on the fly.

From Los Angeles Times • Mar. 7, 2026

I actually didn’t have a game in mind in the first place and had to make one up on the fly.

From "Taking Flight: From War Orphan to Star Ballerina" by Michaela DePrince