To group into one or more sets of two.
The wedding guests were paired boy/girl and groom's party/bride's party.
To bring two (animals, notably dogs) together for mating.
To engage (oneself) with another of opposite opinions not to vote on a particular question or class of questions.
To suit; to fit, as a counterpart.
To impair, to make worse.
To become worse, to deteriorate.
The combination or union of two things.
An agreement between two members of a legislative body holding opposite opinions to refrain from voting, so that both may absent themselves.