motorbike UK /ˈməʊtə(ɹ)ˌbaɪk/US /ˈmoʊtɚˌbaɪk/noun 2verb 1forms 3 noun2 •(US) A small and light motorcycle. •(informal) A motorcycle.Jumping on the Metro and then a local train, we headed out to National Central University at Jhongli, where I had been invited to take a look at a motorbike powered by compressed air. — 2009 verb1 •To ride a motorbike; to travel by motorbike.We motorbiked all over the US that summer. formsmotorbiked · motorbiking · motorbikes