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Region: General | Usage example: I updated the slides on the fly.

On the fly

Meaning

While moving or in real time.

Usage

Used when adjustments happen quickly.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Aviation imagery for in-flight action.

20th-century aviation terms moving into business talk.

Related Idioms

Caught with your pants down

Surprised while unprepared.

Caught red handed

Caught in the act, especially while doing something wrong.

Hold down the fort

Take care of responsibilities while someone else is away.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.