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Discover LudwigThe phrase "an extra key" is correct and usable in written English.
You can use it when referring to an additional key that is not the primary one, often in contexts like security, access, or convenience.
Example: "I always keep an extra key hidden outside in case I lock myself out."
Alternatives: "a spare key" or "an additional key."
Exact(10)
I can rustle you up an extra key".
"They found an extra key in my wallet.
Reliable, robust security — which means cryptography unencumbered by an extra key "under the doormat" — is not just a privacy nicety, but also a matter of national security and public safety.
Get a CD player and stick an extra key under the car with a magnet.
Most alto and bass clarinets have an extra key to allow a (written) E3.
It doesn't hurt to ask for smaller things, like a set of floor mats or an extra key fob, once you've negotiated the price.
Similar(50)
Graduate students: don't forget to return your spare key, laundry room key, and any extra keys provided for a spouse, partner, or child.
B foot: You can buy a foot joint with a few extra keys that enables you to play one chromatic step lower than usual (a B).
Always register in your name and put the extra key in a safe place.
As I'm badgering the clerk for an extra minibar key, I catch a glimpse of Bob Harris.
Hide an extra car key.
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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