벼려요 · 벼렸어요 · 벼릴 거예요 · 벼리세요
to sharpen (a blade by heating and hammering); to hone, to steel (one's resolve)
Example
대장장이가 무딘 칼을 불에 달궈 다시 벼렸어요.
The blacksmith heated the dull knife and sharpened it again.
Word parts
A blacksmith's word: reforging a blade with fire and hammer, unlike 갈다 (grinding on stone).
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