1. to speak or perform without preparation; to improvise

Examples

• The speaker had to extemporize when his notes were lost.
• Jazz musicians often extemporize during their solos.
• She was able to extemporize a speech at the wedding.
• The actor extemporized his lines when he forgot the script.
• Teachers sometimes need to extemporize when lesson plans change.
• He extemporized a melody on the piano.