Definitions:
a set of two things used together or regarded as a unit

an article consisting of two joined or corresponding parts not used separately

either or both of two members of a legislative assembly on opposite sides who absent themselves from voting by mutual arrangement, leaving the relative position of the parties unaffected

put together or join to form a pair

give (a member of a legislative assembly) another member as a pair, to allow both to absent themselves from a vote without affecting the result

wirelessly connect (an electronic device) to another via bluetooth