From Middle English forthgang, forthgong, from Old English forþgang (“a going forth, progress, advance, success, privy, drain, purging, evacuation”), from Proto-Germanic *furþa- (“forth”), *gangaz (“going”), equivalent to forth- + gang. Cognate with Dutch voortgang (“progress, advancement, process, movement”), German Fortgang (“progress”), Swedish fortgång (“progression”).
(third-person singular simple present forthgangs, present participle forthganging, simple past and past participle forthganged)
- (intransitive, obsolete) To go forth.
From Middle English forthgangen, from Old English forþgangan (“to go forth”), equivalent to forth- + gang.