
On the fly
Spontaneity Connotation
Conveys a sense of improvisation and quick thinking in an unplanned situation.

She crafted her speech on the fly and wowed the audience.
Time Pressure
Implies that there was not much time for preparation and the action was done hastily.

The chef prepared the dish on the fly during the sudden rush hour.
Casual Use
More commonly used in casual or informal conversations, not in formal writing.

I'll have to call you back, I'm figuring things out on the fly here.
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