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 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.