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used to begin a list of two or more possibilities: ➔ see usage note also
You add either one or two cloves of garlic.
She's the kind of person you either love or hate.
used to say that if one thing does not happen then something else will have to:
It's your choice! Either she leaves or I will!
£75 seems a lot to pay for a starter motor, but it's either that or a new car!
a situation in which you cannot avoid having to make a decision or choice