เจียระไน(jiia-rá-nai)

Meanings

1VerbB2

[to] cut and polish (gems)

to shape, facet, and polish a gemstone to enhance brilliance and symmetry

Examples

The craftsman used a diamond wheel to facet this stone for symmetry and shine.
2VerbC1

[to] refine; perfect (figurative)

to improve something carefully to make it more refined or excellent (figurative use)

Examples

The professor said the draft is already good, but the language still needs to be refined to flow more smoothly.