Origin: 1375–1425; late Middle English (south); replacing earlier fixen,Middle English (north), for Old English fyxe, feminine of foxfox (compare fyxen (adj.) pertaining to a fox, Old High German fuhsin (noun) vixen)
O.E. *fyxen (implied in adj. fyxan), fem. of fox (see fox, and cf. M.H.G. vühsinne, Ger. füchsin). Solitary English survival of the Germanic feminine suffix -en, -in (cf. O.E. gyden "goddess;" mynecen "nun," from munuc "monk;" wlyfen "she-wolf"). The fig. sense "ill-tempered