The story
- Proto-Germanic · inherited from*kluftiz
- Proto-West Germanic · inherited from*klufti
- Old English · inherited fromġeclyft
- Middle English · inherited fromclifte
- English todaycleft
From Middle English clifte, from Old English ġeclyft, from Proto-West Germanic *klufti, from Proto-Germanic *kluftiz, equivalent to cleave + -t (“-th”). Compare Dutch klucht (“coarse comedy”), Swedish klyft (“cave, den”), German Kluft. See cleave. The modern form with /ɛ/ is by association with Etymology 2 (the past form of cleave).
Etymology from Wiktionary, CC BY-SA 4.0.