Definitions

1. interjection

a signal to be quiet, often used to silence someone or something

“The librarian whispered ‘shh’ to the rowdy children in the library.”

2. verb

to silence or quiet someone or something

“The teacher had to shh the noisy students during the test.”

3. noun

a sound or utterance that signals silence or quietness

“The sound of the ‘shh’ was like a cold breeze on a winter day.”