fell
v.
1
Old English fællan (Mercian), fyllan (West Saxon) "make fall, cause to fall," also "strike down, demolish, kill," from Proto-Germanic *falljan "strike down, cause to fall" (cognates: Old Frisian falla, Old Saxon fellian, Dutch fellen, Old High German fellen, German fällen, Old Norse fella, Danish fælde), causative of *fallan (source of Old English feallan; see fall, v.), showing i-mutation. Related: Felled; feller; felling.
2
past tense of fall, v., Old English feoll.
adj.
"cruel," late 13c., possibly late Old English, perhaps from Old French fel "cruel, fierce, vicious," from Medieval Latin fello "villain" (see felon). Phrase at one fell swoop is from "Macbeth." Related: Fellness.
n.
1
"rocky hill," c.1300, from Old Norse fiall "mountain," from Proto-Germanic *felzam- "rock" (cognates: Old High German felisa, German Fels "stone, rock"), from PIE root *pel(i)s- "rock, cliff." Old High German felisa "a rock" is the source of French falaise (formerly falize) "cliff." Now mostly in place-names, such as Scafell Pike, highest mountain in England.
2
"skin or hide of an animal," Old English fel "skin, hide, garment of skin," from Proto-Germanic *felnam- (cognates: Old Frisian fel, Old Saxon fel, Dutch vel, Old High German fel, German fell, Old Norse fiall, Gothic fill "skin, hide"), from PIE *pel-no-, suffixed form of root *pel- (4) "skin, hide" (see film, n.). Related: Fellmonger.