Actor's instruction to play 'As You Like It'? (2-3)
I believe the answer is:
ad-lib
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for ad-lib that I've seen before include "Off the cuff remark" , "Speak off the cuff" , "Speak without preparation" , "Extemporise" , "spontaneous comment" .)