(informal) surreptitiously

(transitive) To cause (someone or something) to become quiet. / (intransitive) To become quiet or calm.

Be quiet.

The absence of sound; quietness. / The absence of movement; stillness, tranquility. / The absence of disturbance or trouble; peace, security.

(imperative) Remain silent.

not loud; making very little sound

Absence of sound; silence or hush. / Absence of disturbance; calm, stillness or serenity.

present participle of quiet

The act of making something quiet.

Third-person singular simple present indicative form of quiet