Crossword Genius

Sudden divergence (7)

Ross

I believe the answer is:

tangent

(Other definitions for tangent that I've seen before include "Line that touches curve without crossing it" , "mathematician's line" , "At which one can go off" , "Completely different line of thought - trigonometrical function" , "Geometric line" .)

I've seen this clue in the Sydney Morning Herald.
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