出典:Wiktionary
From Middle English forthgon, forthgan, from 古期英語 forþgān (“to go forth, advance, proceed, pass by, go away, go on, precede, succeed”), from Proto-Germanic *furþą (“forth”), *gāną (“to go”), equivalent to forth- + go. Cognate with Dutch voortgaan (“to continue, proceed, go ahead”), German fortgehen (“to go away, leave, depart, blin”), Swedish fortgå (“to continue, go on, proceed”).