[{"Bold_text": "noun", "List Items": ["an obstruction placed across a road ,especially of barricades or police cars, for halting or hindering traffic, as to facilitate the capture of a pursued car or inspection for safety violations.", "an obstruction on a road ,as a fallen tree or a pile of fallen rocks.", "a hastily built barricade, as of barbed wire, erected across a road hold up the advance of an enemy.", "an action, condition, etc., that obstructs progress toward an objective:Nationalism is a roadblock to European unity."]}, {"Bold_text": "verb (used with object)", "List Items": ["to halt or obstruct with or as if with a roadblock."]}]