WordNet: down, fine-tune, polish, refine

improve or perfect by pruning or polishing; "refine one's style of writing"

• hypernym ameliorate, amend, better, improve, meliorate

• hyponym over-refine, overrefine

• hyponym civilise, civilize, cultivate, educate, school, train

down

• (suomi) viimeistellä (synonyymi; <unconfirmed/>)

fine-tune

• (suomi) hienosäätää (synonyymi)

polish

• (englanti) polish (derivationally related)
• (suomi) kehittää (synonyymi)

• (suomi) parantaa (synonyymi)

refine

• (englanti) refinement (derivationally related)

• (englanti) refinement (derivationally related)

• (englanti) refiner (derivationally related)
• (suomi) parannella (synonyymi)