出典:Wiktionary
From Middle English thurhgon, from 古期英語 þurhgān (“to go through, go over, pass through, pierce, penetrate, permeate, pervade”), equivalent to thorough- + go. Cognate with Dutch doorgaan (“to go on, continue, go through, proceed”), German durchgehen (“to go through, pass through”).
thoroughgo (三人称単数 現在形 thoroughgoes, 現在分詞 thoroughgoing, 過去形 thoroughwent, 過去分詞 thoroughgone)