From Middle English forshrinken, forschrinken, from Old English forsċrincan (“to shrink up, dry up, wither away”), equivalent to for- (“completely, to the fullest extent”) + shrink.
forshrink (third-person singular simple present forshrinks, present participle forshrinking, simple past forshrank, past participle forshrunk or forshrunken)
- (intransitive, archaic) To shrink up; dry up; wither.
- 1870, Geoffrey Chaucer, Charles Cowden Clarke, The riches of Chaucer:
- Forshrunk with heat the ladies eke to-brent, [...]