bistro UK /ˈbiːstɹəʊ/US /ˈbiːstɹoʊ/noun 1verb 1forms 3 noun1 •A small casual restaurant or pub, typically serving French-style cuisine.Now, a coalition of bistro owners, unions and trade organizations is lobbying to get Unesco to grant Paris's sidewalk bistros and cafes official status as France's "intangible cultural heritage." — 2018 verb1 •(rare) To eat at a bistro. formsbistroed · bistroing · bistros