improvise
🇺🇸
/ˈɪmprəvaɪz/
🇬🇧
/ˈɪmprəvaɪz/
to create something using what is available, without much planning
When the power went out, we had to improvise and use candles for light.
to create music, speech, or action on the spot, without prior preparation
The comedian improvised a funny story that had everyone laughing.