- yesterday (n.)
- Old English geostran dæg, from dæg "day" (see day) + geostran "yesterday," from Proto-Germanic *gestra- (cf. Old High German gestaron, German gestern "yesterday," Old Norse gær "tomorrow, yesterday," Gothic gistradagis "tomorrow"), originally "the other day" (reckoned from "today," either backward or forward), from PIE *ghes (cf. Sanskrit hyah, Avestan zyo, Persian di, Greek khthes, Latin heri, Old Irish indhe, Welsh doe "yesterday;" Latin hesternus "of yesterday").