[{"Bold_text": "noun", "List Items": ["a narrow opening produced by cleavage separation of parts.", "cleavage ( def 1 ) cleavage ( def 1 ).", "Anatomy.a natural division or groove in an organ, as in the brain."]}, {"Bold_text": "verb (used with object)", "List Items": ["to make fissures in; cleave; split."]}, {"Bold_text": "verb (used without object)", "List Items": ["to open in fissures; become split."]}]