polish, refine, fine-tune, down -- (improve or perfect by pruning or polishing; "refine one's style of writing")
complicate, refine, rarify, elaborate -- (make more complex, intricate, or richer; "refine a design or pattern")
refine -- (treat or prepare so as to put in a usable condition; "refine paper stock"; "refine pig iron"; "refine oil")
refine, rectify -- (reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities; "refine sugar")
refine -- (attenuate or reduce in vigor, strength, or validity by polishing or purifying; "many valuable nutrients are refined out of the foods in our modern diet")
refine -- (make more precise or increase the discriminatory powers of; "refine a method of analysis"; "refine the constant in the equation")
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