Crossword Genius

Shut up and got on (7)

Ross

I believe the answer is:

boarded

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'got on' is the definition.
('board' can be a synonym of 'get on')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for boarded that I've seen before include "Embarked" , "Got on (a ship)" .)

I've seen this clue in the Evening Standard.
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