the.com/cleft

a gap where two halves forgot to shake hands before the curtain rose

means A split, crack, or deep indentation that divides something into parts — like a cleft chin or a cleft in the rock.

from From Old English 'clyft,' tied to the verb 'cleofan' meaning to split or cleave — the same root behind 'cleave.' It belongs to a Germanic family of splitting words, a cousin of Old High German and Old Norse terms for cracking apart. Curiously, 'cleave' carries opposite meanings — to split and to cling — but the 'cleft' sense is firmly the splitting one, the past participle that hardened into a noun for the gap left behind.

chin science
Cleft chins are a genetic quirk of fused jawbone
in palate
Forms when facial plates fail to meet before birth
musical use
Treble clef shares the root: a splitting mark
rock climbing
A cleft in stone is a climber's ladder
word origin
From Old English cleofan, meaning to split apart
for instance

cleft palate — congenital condition affecting 1 in 700 births worldwide, visible split in the roof of the mouth

chin cleft — dimple or indentation on the chin, common dominant genetic trait seen in many celebrities like john travolta

cleft lip — birth defect occurring in 1 in 1,000 births, vertical split in the upper lip often paired with cleft palate

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