- fourfold (adj.)
[fourfold 词源字典]
- Old English feowerfeald; see four + -fold. As an adverb from 1530s. Similar formation in Old Frisian fiuwerfald, Dutch viervoudig, Old High German fiervalt, German vierfältig, Danish firfold, Gothic fidurfalþs.[fourfold etymology, fourfold origin, 英语词源]