malfunction /ˌmælˈfʌŋk.ʃən/noun 2verb 2forms 3 noun2 •Faulty functioning.This weekend, as videos of robotaxi malfunctions began appearing on social media, opponents say they are seeing their fears realized. — 2023 •Failure to function. verb2 •To function improperly.She told him the machine was poorly built, but they both knew that she was the one who had malfunctioned. •To fail to function. formsmalfunctioned · malfunctioning · malfunctions