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Discover LudwigThe phrase "activate on the fly" is correct and usable in written English.
It is typically used in contexts where something can be activated or initiated quickly and without prior preparation, often in technology or software discussions.
Example: "The system allows users to activate on the fly, making it easier to adjust settings in real-time."
Alternatives: "enable instantly" or "turn on dynamically".
Idiom
On the fly.
If you do things on the fly, you do things without preparation, responding to events as they happen.
Exact(1)
In the XTENS repository authorized users can create and activate on the fly new process, event and data types, without the need to recompile the application.
Similar(59)
As I did, something activated on the phone.
Two alkaline solutions with different soluble silica contents were utilised to activate the fly ash.
It was found that CKD was much more effective in activating the fly ash than gypsum.
Unbeknownst to Seth, a fly has landed in the opposite telepod, and when the machine is activated, Brundle and the fly are merged at a molecular level.
Users may activate error notifications of varying stringency on the fly, and use these messages as a guide toward a consistent, syntactically correct model.
When odorant molecules bind to receptors on the fly's antennae, they activate neurons in the antennal lobe of the brain, which in turn activate cells called Kenyon cells within the mushroom body.
Silencing these neurons caused fruit flies to eat too much, whereas activating them caused the flies to eat less.
The effects were additive: in other words, activating two MBONs that were both innately attractive had a bigger impact on the behavior of the fly than just activating one.
The evolution happened on the fly.
The site evolved on the fly.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com