from
The Collaborative International Dictionary of English v.0.48
Pair \Pair\, v. i. [imp. & p. p. {Paired}; p. pr. & vb. n.
{Pairing}.]
1. To be joined in pairs; to couple; to mate, as for
breeding.
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2. To suit; to fit, as a counterpart.
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My heart was made to fit and pair with thine.
--Rowe.
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3. Same as {To pair off}. See phrase below.
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{To pair off}, to separate from a group in pairs or couples;
specif. (Parliamentary Cant), to agree with one of the
opposite party or opinion to abstain from voting on
specified questions or issues. See {Pair}, n., 6.
[1913 Webster]