Mum. interject. [Of this word I know not the original; it may be observed, that when it is pronounced it leaves the lips closed.] A word denoting prohibition to speak, or resolution not to speak; silence; hush.
Mum then, and no more proceed. Shakesp. Tempest.
Well said, master; mum! and gaze your fill. Shakesp.
The citizens are mum, say not a word. Shak. Rich. III.
Intrust it under solemn vows
Of mum, and silence, and the rose. Hudibras, p. iii.