Mum

a. [Cf. MUMBLE, MUMM, and MOME.] Silent; not speaking. The citizens are mum; say not a word. Shak.

Be silent; hush.

n. [Ger. mumme, from Chr. Mumme, who first brewed it in 1492.] A sort of strong beer, originally introduced from Brunswick, in Germany, and hence often called Brunswick mum. The clamorous crowd is hushed with mugs of mum. Pope.