Definition of shtum noun from the Oxford Advanced Learner's Dictionary

 

shtum

 noun
(also schtum)noun
BrE BrE//ʃtʊm//
 
; NAmE NAmE//ʃtʊm//
 
[uncountable]
 
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Word Origin 1950s: Yiddish, from German stumm.Idioms
keep/stay shtum
 
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(British English, informal) to not speak Police have appealed for witnesses, but it seems the locals are keeping shtum.