extemporize

英 [ɪk'stempəraɪz; ek-] 美[ɪk'stɛmpəraɪz]

• vi. 即兴演奏或演说；临时凑合
• vt. 即兴演奏或演说；当场作成

1. manage in a makeshift way; do with whatever is at hand;

"after the hurricane destroyed our house, we had to improvise for weeks"

2. perform without preparation;

"he extemporized a speech at the wedding"