Everyday English
on the fly
without preparation while something is happening
If you do something on the fly, you do it while a situation is happening, without preparing it beforehand.
Hear it in real life
Did you plan the trip carefully?
Not really; we made most decisions on the fly.
I had to make the presentation on the fly when my colleague got sick.
The mistake everyone makes
Not: We chose a new route in the fly.
Say: We chose a new route on the fly.
The fixed preposition is "on," not "in."
Build it
How it fits in a sentence.
decide on the fly; make something on the fly; change something on the fly
Your turn: say it out loud
I had to make the presentation on the fly when my colleague got sick.
Say it out loud two or three times, until it feels like yours.
on the fly
without preparation while something is happening
“I had to make the presentation on the fly when my colleague got sick.”
heytardy
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