Suppress, stifle (4,2)

I believe the answer is:

hush up

This clue is a double definition.

'suppress' is the first definition.
(I know this)

'stifle' is the second definition.
(thesaurus)

(Other definitions for hush up that I've seen before include "Suppress rumours" , "silence" , "Suppress public mention of (something)" , "Keep silent" , "Cover up, keep quiet" .)

I've seen this clue in The Times.

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