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 : improvise
Meaning : Perform without preparation.
Example :
He extemporized a speech at the wedding.
Synonyms : ad-lib, extemporise, improvise, improvize
Extemporize meaning in Bengali (Bangla).