How to use
one or the other of two things or people
There's tea or coffee - you can have either.
We can offer a comfortable home to a young person of either sex.
Could either of you lend me five pounds?
used to show that a negative statement is true about both of two things or people
I've lived in New York and Chicago, but don't like either city very much.
There were two witnesses but I wouldn't trust either of them.
either side/end/hand etc
both sides, ends, hands etc
He sat in the back of the car with a policeman on either side.
There are shops at either end of the street.
used to say that something will be the same whichever of two things happens or is true
You can get to Edinburgh by train or plane, but either way it's very expensive.
more or less than a certain amount or measurement
A few marks either way can make the difference between a pass and a fail.
used to say that someone or something does not firmly support or want either one of two things
'All right, let's do that,' said Camille, who didn't care either way.
could go either way
if a situation could go either way, both possible results are equally likely
The latest opinion poll suggests the vote could go either way.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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