Mum

Part of speech: noun (n.)

Silence. [R.] Hudibras.

Part of speech: noun (n.)

A sort of strong beer, originally made in Brunswick, Germany. Addison. The clamorous crowd is hushed with mugs of mum. Pope.

Part of speech: adjective (a.)

Silent; not speaking. Thackeray. The citizens are mum, and speak not a word. Shak.

Part of speech: interjection (interj.)

Be silent! Hush! Mum, then, and no more. Shak.