What word or phrase does your mother always say?
1590s, variant of Middle English gonfanon (c.1300), from Old French gonfanon "knight's pennon" (12c.), from Old High German guntfano "battle flag," from Proto-Germanic *gunthja- "war," from PIE *gwhen- "to strike, kill" (see bane) + *fano "banner" (cf. Gothic fana "cloth"). Cognate with Old English guþfana, Old Norse gunnfani. Change of -n- to -l- by dissimilation.