pairyoudaoicibaDictYouDict[pair 词源字典]
pair: [13] Like English par [17], parity [16], and peer ‘noble’ [13], pair comes ultimately from Latin pār ‘equal’, a word of unknown origin. Its derivative paria ‘equal things, similar things’ passed into English via Old French paire. Other English descendants of Latin pār include compare, disparage [14], nonpareil [15], and umpire.
=> compare, disparage, nonpareil, par, parity, peer, umpire[pair etymology, pair origin, 英语词源]
pair (v.)youdaoicibaDictYouDict
"to come together with another; be mated or married" (intransitive), also "to make a pair by matching" (transitive), c. 1600, from pair (n.). These senses now often are distinguished by pair off (c. 1803) for the former and pair up (1908) for the latter. Related: Paired; pairing.
pair (n.)youdaoicibaDictYouDict
mid-13c., "two of a kind coupled in use," from Old French paire "pair, couple," and directly from Medieval Latin paria "equals," neuter plural of Latin par (genitive paris) "a pair, counterpart, equal," noun use of par (adj.) "equal, equal-sized, well-matched" (see par (n.)). Originally of things. Of persons from late 14c. Meaning "a woman's breasts" is attested from 1922. Pair bond (v.) is first attested 1940, in reference to birds mating.