Middle English word forstoppen comes from Old English stoppian ((a hole or aperture) To close. To stop.), Old English for-

Detailed word origin of forstoppen

Dictionary entry	Language	Definition
stoppian	Old English (ang)	(a hole or aperture) To close. To stop.
for-	Old English (ang)	Forming verbs from verbs with various senses especially ‘wrongly, away from, astray, abstention, prohibition, perversion, destruction’. Used to create intensified adjectives and verbs from other adjectives and verbs, with the sense of completely or fully. Compare Modern English use of up. Very.
forstoppian	Old English (ang)	To stop up.
forstoppen	Middle English (enm)

Words with the same origin as forstoppen