smoothen

verbs

make smooth or smoother, as if by rubbing

"smooth the surface of the wood"

smooth, smoothen

make (a surface) shine

"shine the silver, please"; "polish my shoes"

polish, shine, smooth, smoothen

become smooth

smoothen

is a type of (narrower)

undergo a change; become different in essence; losing one's or its original nature

"She changed completely as she grew older"; "The weather changed last night"