[{"Bold_text": "verb (used with or without object)", "List Items": ["to hit hard, especially on the head.", "clonk(def2) clonk(def2)."]}, {"Bold_text": "noun", "List Items": ["a hard hit, especially on the head.", "Informal.a stupid person; clunkhead .", "clonk(def1) clonk(def1).", "Informal. clunker(def2) clunker(def2)"]}]