frankyoudaoicibaDictYouDict[frank 词源字典]
frank: [13] To call someone frank is to link them with the Germanic people who conquered Gaul around 500 AD, the Franks, who gave their name to modern France and the French. After the conquest, full political freedom was granted only to ethnic Franks or to those of the subjugated Celts who were specifically brought under their protection. Hence, franc came to be used as an adjective meaning ‘free’ – a sense it retained when English acquired it from Old French: ‘He was frank and free born in a free city’, John Tiptoft, Julius Caesar’s commentaries 1470.

In both French and English, however, it gradually progressed semantically via ‘liberal, generous’ and ‘open’ to ‘candid’. Of related words in English, frankincense [14] comes from Old French franc encens, literally ‘superior incense’ (‘superior’ being a now obsolete sense of French franc), and franc [14], the French unit of currency, comes from the Latin phrase Francorum rex ‘king of the Franks’, which appeared on the coins minted during the reign of Jean le Bon (1350–64).

The Franks, incidentally, supposedly got their name from their preferred weapon, the throwing spear, in Old English franca.

=> french[frank etymology, frank origin, 英语词源]
frank (adj.)youdaoicibaDictYouDict
c. 1300, "free, liberal, generous;" 1540s, "outspoken," from Old French franc "free (not servile); without hindrance, exempt from; sincere, genuine, open, gracious, generous; worthy, noble, illustrious" (12c.), from Medieval Latin francus "free, at liberty, exempt from service," as a noun, "a freeman, a Frank" (see Frank).

A generalization of the tribal name; the connection is that Franks, as the conquering class, alone had the status of freemen in a world that knew only free, captive, or slave. For sense connection of "being one of the nation" and "free," compare Latin liber "free," from the same root as German Leute "nation, people" (see liberal (adj.)) and Slavic "free" words (Old Church Slavonic svobodi, Polish swobodny, Serbo-Croatian slobodan) which are cognates of the first element in English sibling "brother, sister" (in Old English used more generally: "relative, kinsman").
Frank (n.)youdaoicibaDictYouDict
one of the Germanic tribal people (Salian Franks) situated on the lower Rhine from 3c. that conquered Romano-Celtic northern Gaul c.500 C.E.; from their territory and partly from their language grew modern France and French. Old English franc, franca "freeman, noble; Frank, Frenchman," from Medieval Latin francus, a Late Latin borrowing of Frankish *Frank, the people's self-designation (cognate with Old High German Franko, the Latin word also is the source of Spanish and Italian names Franco).

The origin of the ethnic name is uncertain; it traditionally is said to be from the old Germanic word *frankon "javelin, lance" (compare Old English franca "lance, javelin"), their preferred weapon, but the reverse may be the case. Compare also Saxon, traditionally from root of Old English seax "knife." The adjectival sense of "free, at liberty" (see frank (adj.)) probably developed from the tribal name, not the other way round. It was noted by 1680s that, in the Levant, this was the name given to anyone of Western nationality (compare Feringhee and lingua franca).
frank (n.)youdaoicibaDictYouDict
short for frankfurter, by 1916, American English. Franks and beans attested by 1953.
frank (v.)youdaoicibaDictYouDict
"to free a letter for carriage or an article for publication, to send by public conveyance free of expense," 1708, from shortened form of French affranchir, from a- "to" + franchir "to free" (see franchise (v.)). A British parliamentary privilege from 1660-1840; in U.S. Congress, technically abolished 1873. Related: Franked; franking. As a noun, "signature of one entitled to send letters for free," from 1713.