[with obj.]create and perform (music, drama, or verse) spontaneously or without preparation 即席创作表演(音乐,戏剧,诗歌) the ability to improvise operatic arias in any given style. 即席创作任一风格歌剧咏叹调的能力。 [no obj.]he was improvising to a backing of guitar chords. 他在吉他和弦的陪衬下即席表演。 [as adj. improvised]improvised humour. 即席而作的幽默。 ■produce or make (something) from whatever is available 凑合出… I improvised a costume for myself out of an old blue dress. 我穿上一件蓝色旧衣服,给自己凑合了一身装束。 [as adj. improvised]we camped out, sleeping on improvised beds. 我们在外露营,睡在凑合而成的床上。
early 19th cent.: from French improviser or its source, Italian improvvisare, from improvviso 'extempore', from Latin improvisus 'unforeseen', based on provisus, past participle of providere 'make preparation for'