Crossword Genius

Keep quiet, as those in car should (4,2)

Ross

I believe the answer is:

belt up

I believe this is a double definition.

'keep quiet' is the first definition.
(both are used to tell someone to be quiet)

'as those in car should' is the second definition.
(put a seatbelt on)

(Other definitions for belt up that I've seen before include "Be quiet (colloq.)" , "Wear car safety device - be quiet" , "put a sock in it!" , "To secure safety strap" , "Strap yourself in - keep quiet!" .)

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.