What does 炼 (liàn) mean in English?

Card 1040HSK Level 31040/2202
CARD1040
PROGRESS47%
liàn
refine; smelt; burn; try to find the best (word)(Verb)

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d