[{"Bold_text": "adverb", "List Items": ["beneath the surface of the ground : ground :traveling underground by subway.", "in concealment or secrecy; not openly:subversion carried on underground."]}, {"Bold_text": "adjective", "List Items": ["existing, situated, operating, or taking place beneath the surface of the ground . ground .", "used, or for use, underground.", "hidden or secret; not open:underground political activities.", "published or produced by political or social radicals or nonconformists:an underground newspaper.", "avant-garde; experimental:an underground movie.", "critical of or attacking the established society or system:underground opinion.", "of or for nonconformists; unusual:an underground vegetarian restaurant."]}, {"Bold_text": "noun", "List Items": ["the place or region beneath the surface of the ground . ground .", "an underground space or passage.", "a secret organization fighting the established government or occupation forces:He fought in the French underground during the Nazi occupation of France.", "(often initial capital letter)a movement or group existing outside the establishment and usually reflecting unorthodox, avant-garde, or radical views.", "Chiefly British.a subway system."]}, {"Bold_text": "verb (used with object)", "List Items": ["to place beneath the surface of the ground : ground :to underground utility lines."]}]