PSST


Meaning of PSST in English

/ pst; NAmE / exclamation

the way of writing the sound people say when they want to attract sb's attention quietly :

Psst! Let's get out now before they see us!

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WORD ORIGIN

1920s: imitative.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.