Meaning of “either” - Learner’s Dictionary

either

adverb us uk /ˈaɪðər, ˈiːðər/
Extra Examples
"I can't go to the party." "No, I can't either."He wasn't the only one, either."I've never been to Mexico." "No, I've never been there either."Call John and tell him you can't come either."I don't like those cars." "No, I don't either."

B1 used in negative sentences to mean that something else is also true:

The menu is boring and it's not cheap either.
I don't eat meat and Sam doesn't either.

(Definition of “either adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)