Definitions
1.nounAn opening, fissure, or V-shaped indentation made by or as if by splitting.
2.nounA piece made by splitting."a cleft of wood"
3.nounA disease of horses; a crack on the band of the pastern.
4.verbTo syntactically separate a prominent constituent from the rest of the clause that concerns it, such as threat in "The threat which I saw but which he didn't see, was his downfall."