fourteen (n.)youdaoicibaDictYouDict[fourteen 词源字典]
c. 1300, from Old English feowertyne; see four + -teen. Compare Old Saxon fiertein, Old Frisian fiuwertine, Dutch veertien, Old High German fiorzehan, German vierzehn, Danish fjorten, Gothic fidwortaihun.[fourteen etymology, fourteen origin, 英语词源]