- to elevate in character; sublimate.
- to make (the mind, senses, etc.) keen or discerning; sharpen.
- to introduce subtleties into or argue subtly about.
- to make thin, rare, or more fluid or volatile; refine.
- to make subtle distinctions or to argue subtly.
- to bring to a purer state; refine
- to debate subtly
- to make (the mind, etc) keener