Полный русско-английский словарь
экспромт
Муж. impromptu, improvisation, extemporization; something composed on the spur of the moment; something one just dashed off м. impromptu, improvisation; ~ом нареч. impromptu, on the spur of the moment; произнести речь ~ом make* an impromptu speech, speak* extempore, extemporize.