Crossword Genius

Let out a notch, perhaps

Ross

I believe the answer is:

loosen

(Other definitions for loosen that I've seen before include "Untie, relax" , "Undo a little" , "Undo, make less tight" , "Relax the tension" , "Make less tight, slacken" .)

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