Crossword Genius

Cuts lines on graph? (4)

Ross

I believe the answer is:

axes

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But I can't explain it at all! Could you help me understand?

(Other definitions for axes that I've seen before include "Main graph lines" , "alliances" , "Cutters; lines on graph" , "Choppers" , "guitars" .)

I've seen this clue in The Times.
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