Middle English word forclingen comes from Old English clingan, Old English for-, and later Old English forclingan (To shrink up.)

Detailed word origin of forclingen

Dictionary entry	Language	Definition
clingan	Old English (ang)	To cling.. To whither, pine, shrink up, shrink together from heat or cold.
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.
forclingan	Old English (ang)	To shrink up.
forclingen	Middle English (enm)

Words with the same origin as forclingen