__ one's skills; improve
I believe the answer is:
hone
(Other definitions for hone that I've seen before include "Smooth stone" , "Polish" , "Sharpen (a blade)" , "Sharpen tool on stone" , "Strop" .)
I believe the answer is:
hone
(Other definitions for hone that I've seen before include "Smooth stone" , "Polish" , "Sharpen (a blade)" , "Sharpen tool on stone" , "Strop" .)