- join[join 词源字典]
- join:  Join goes back ultimately to a prehistoric Indo-European *jug- (which also produced English adjust, conjugal, jostle, joust, jugular, juxtapose, subjugate, yoga, and yoke). Its Latin descendant was jungere ‘join’, which passed into English via joign-, the present stem of Old French joindre. The Latin past participial stem junct- gave English junction  and juncture , and also, via Spanish, junta  (etymologically a body of people ‘joined’ together for a particular purpose, hence a ‘governing committee’).
=> adjust, conjugal, joust, jugular, junction, junta, juxtapose, subjugate, yoga, yoke[join etymology, join origin, 英语词源]
- join (v.)
- c. 1300, from stem of Old French joindre "join, connect, unite; have sexual intercourse with" (12c.), from Latin iungere "to join together, unite, yoke," from PIE *yeug- "to join, unite" (see jugular). Related: Joined; joining. In Middle English, join sometimes is short for enjoin. Join up "enlist in the army" is from 1916. Phrase if you can't beat them, join them is from 1953. To be joined at the hip figuratively ("always in close connection") is by 1986, from the literal sense in reference to "Siamese twins."