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1570s, alteration (by influence of cleft, new weak past participle of cleave (v.1)), of Middle English clift (early 14c.), from Old English geclyft (adj.) "split, cloven," from Proto-Germanic *kluftis (cf. Old High German and German kluft, Danish kløft "cleft"), from PIE *gleubh- (see glyph). In Middle English anatomy, it meant "the parting of the thighs" (early 14c.).
late 14c., past participle adjective from cleave (v.1)). Cleft palate attested from 1828.
"to split," Old English cleofan, cleven, cliven "to split, separate" (class II strong verb, past tense cleaf, past participle clofen), from Proto-Germanic *kleubanan (cf. Old Saxon klioban, Old Norse kljufa, Danish klöve, Dutch kloven, Old High German klioban, German klieben "to cleave, split"), from PIE root *gleubh- "to cut, slice" (see glyph).
Past tense form clave is recorded in Northern writers from 14c. and was used with both verbs (see cleave (v.2)), apparently by analogy with other Middle English strong verbs. Clave was common to c.1600 and still alive at the time of the KJV; weak past tense cleaved for this verb also emerged in 14c.; cleft is still later. The past participle cloven survives, though mostly in compounds.
"to adhere," Middle English cleven, clevien, cliven, from Old English clifian, cleofian, from West Germanic *klibajanan (cf. Old Saxon klibon, Old High German kliban, Dutch kleven, Old High German kleben, German kleben "to stick, cling, adhere"), from PIE *gloi- "to stick" (see clay). The confusion was less in Old English when cleave (v.1) was a class 2 strong verb; but it has grown since cleave (v.1) weakened, which may be why both are largely superseded by stick (v.) and split (v.).
A split or fissure between two parts.