wherewith UK /wɛəˈwɪð/US /ʍɛɚˈwɪð/adverb 1noun 1forms 1 adverb1 •(no longer used) With which; with what.Yee are the salt of the earth: But if the salt haue lost his sauour, wherewith shall it bee salted? — 1611 noun1 •(no longer used) Something with which; the means by which.Hath not he wherewith [translating dequoy] to be beholding vnto this his killing vivacitie? — 1603 formswherewiths