Mum (?), a. [Of imitative origin. Cf. Mumble.] Silent; not speaking. Thackeray.
The citizens are mum, and speak not a word. Shak.
Webster's Dictionary 1913
Mum (?), a. [Of imitative origin. Cf. Mumble.] Silent; not speaking. Thackeray.
The citizens are mum, and speak not a word. Shak.