Meaning : Perform without preparation.
Example :
He extemporized a speech at the wedding.
Synonyms : ad-lib, extemporise, extemporize, improvize
Meaning : Manage in a makeshift way. Do with whatever is at hand.
Example :
After the hurricane destroyed our house, we had to improvise for weeks.
Synonyms : extemporize
Improvise meaning in Bengali (Bangla).