mum

Definitions:

A species of ale brewed from wheaten malt, so called from the name of the brewer, Mumme.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
A kind of strong ale.
- Newage Dictionary DB (noun) (n.) (noun)
Silent: int. hush ! be silent. Mum budget, an expression denoting secrecy, as well as silence. Mum- chance, a game of hazard with cards; a fool.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Silent.
- Newage Dictionary DB (adjective) (adj.) (adjective)
Silence.
- Newage Dictionary DB (noun) (n.) (noun)
Ale or beer brewed from wheaten malt.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
To wear a mask for sport.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (verb) (v. i.) (verb intransitive)
Be silent!.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (interjection) (interj.) (interjection)
of China
- Wordnet Dictionary DB (noun) (n.) (noun)
Be silent! Hush!
- Newage Dictionary DB (interjection) (interj.) (interjection)
A sort of beer made in Germany.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
Silent; not speaking: int. be silent or secret.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)

Usage examples:

And yet does not the word " mum go for one's finger beside the nose?
- Letters of John Keats to His Family and Friends by John Keats
But don't that bring him to this so often, Mum
- The Complete Project Gutenberg Works of George Meredith by George Meredith
That's always best, mum
- The Eustace Diamonds by Anthony Trollope