Crossword Genius

Shut it! (4,2)

Ross

I believe the answer is:

belt up

(Other definitions for belt up that I've seen before include "Be quiet, or secure yourself in car seat" , "To secure safety strap" , "Strap yourself in - keep quiet!" , "Rudely silence" , "Be quiet (colloq.)" .)

I've seen this clue in The Guardian.
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