expostulate UK /ɛksˈpɒstjʊleɪt/US /ɛksˈpɑstjʊleɪt/ verb1 •To protest or remonstrate; to reason earnestly with a person on some impropriety of conduct [(often) with with].Men expostulate with erring friends; they bring accusations against enemies who have done them a wrong. — 1881 formsexpostulated · expostulating · expostulates · expostulateth