thrice

PIE word *tréyes From Middle English thrice, thries (“three times, thrice; a third time; repeated three times”), from earlier thrī, thrīe (“three times, thrice; a third time”) (from Old English þriwa, þreowa) + -es (suffix forming adverbs of time, place, and manner) (from Old English -es (suffix forming adverbs)). The word is cognate with Old Frisian thria ("thrice"; > Saterland Frisian träie (“thrice”)), Middle Low German drîes (“thrice”), Middle High German drīes, drīs (“thrice”).

出典: Wiktionary「thrice」（CC BY-SA 4.0）