Crossword Genius

Sharpen, as a knife (4)

Ross

I believe the answer is:

hone

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sharpen as a knife</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for hone that I've seen before include "Polish" , "Sharpen tool on stone" , "Sharpen (a blade)" , "Smooth stone" , "Strop" .)

I've seen this clue in The New York Times.
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