Crossword Genius

Shut up (6)

Ross

There are a few possibilities for this:

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4

6

7 8 11 3,1,4,2,2 4,3
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This clue could be a double definition.

'shut' is the first definition.
(thesaurus)

'up' is the second definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for immure that I've seen before include "Imprison, shut in" , "Confine in a closed space" , "Sketches" , "Confine; wall in" , "Enclose within walls, incarcerate" .)

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