импровизировать bedeutet auf Englisch

ad-lib (ad lib) [ad-libbed, ad-libbed, ad-libbing, ad-libs]▼(to improvise)
verb
[UK: ˌæd.ˈlɪb] [US: ˈæd.ˈlɪb]

improvise [improvised, improvising, improvises]▼(to make something up as one goes on)
verb
[UK: ˈɪm.prə.vaɪz] [US: ˈɪm.prə.ˌvaɪz]

shoot from the hip▼(speak or act quickly)
verb

extemporize [extemporized, extemporizing, extemporizes]▼(to act, particularly to perform or speak, without prior planning or thought)
verb
[UK: ɪk.ˈstem.pə.raɪz] [US: ɪk.ˈstem.pə.raɪz]