PSST

Interjection

psst (with more 's' as needed)

(onomatopoeia) Implies that the speaker is sending secret or whispered information to another person.

Synonyms

• hist; see also hey

Verb

psst (third-person singular simple present pssts, present participle pssting, simple past and past participle pssted)

(informal) To say psst, to get someone's attention or to communicate with them.

Anagrams

• SPST, STPs, TPS's, tsps

Source: Wiktionary