polish
琢 centers on refining a raw material by careful work: polishing a gem or stone to bring out its beauty.
琢 combines 王 (jade/jewel) with 豖, which likely contributes the sound and may suggest the action of striking or carving, together expressing the polishing of gems.
The left side 王 represents a jewel or gemstone, and the right side 豖 looks like a tool striking it. Picture a craftsman carefully polishing a rough gem until it shines.
For タク, imagine a tack being used to polish a tiny gem: tack -> タク, and the sharp point refines the stone.