pair

a set of two similar things considered as a unit

two items of the same kind

two people considered as a unit

a poker hand with 2 cards of the same value

form a pair or pairs; "The two old friends paired off"

bring two objects, ideas, or people together; "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"

occur in pairs

arrange in pairs; "Pair these numbers"

engage in sexual intercourse; "Birds mate in the Spring"