an extra (something)
"An extra ___" means one more than you need of something:
Do you have an extra pen?
There's an extra towel in the closet on the top shelf, if you need one.
"An extra ___" means one more than you need of something:
Do you have an extra pen?
There's an extra towel in the closet on the top shelf, if you need one.
Follow PhraseMix