Keep Shtum Meaning
(intransitive, colloquial, idiomatic) Don't tell anyone; especially, keep silent about something that may be sensitive or secret.
Example: If I tell you, you have to promise to keep shtum about it.‎
2012, Kevin Barry, Dark Lies the Island, Random House (ISBN 9781407086149), page 12
And I would plead that the situation is not unusual. It's just one of those things you're supposed to keep shtum about.
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