Definition from macmillandictionary.com
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Those boots cost fifty pounds a pair.
I need a pair of earrings to go with this outfit.
a pair of beautiful blue eyes
a pair of shoes/socks/gloves
I can’t find the pair for this sock.
My glasses are getting old and I probably need a new pair.
a pair of scissors/binoculars/pliers
a pair of trousers/pants/tights
The pair became good friends.
several pairs of identical twins
a pair of lovers
Two pairs of guards stood just inside the main entrance to the museum.
A pair of sparrows had made a nest in the hedge.
a breeding pair of tropical fish
a carriage and pair