get on (v.)youdaoicibaDictYouDict[get on 词源字典]
1590s, "to put on," from get (v.) + on (adv.). Meaning "prosper" is from 1785; that of "to advance, make progress" is from 1798; that of "be friendly" (with) is attested by 1816.[get on etymology, get on origin, 英语词源]