Mum's the word Mum's the word Mum's the word is a popular English idiom. It is related to an expression used by William Shakespeare, in "Henry VI, Part 2". The word “mum” is a slanged version of momme, which was used between 1350-1400 in Middle English with very close to the same meaning: Be silent; Do not reveal "Mum's the word" means to keep silent or quiet. "Mum" is a Middle English word meaning 'silent', and may be derived from the "mummer" who acts without speaking. Note the similar English word "mime" (Old English "mīma", Latin "mimus") meaning silent actor or imitator. The
Old English grammar Old English had free word order, this is not quite true, as there were conventions for the positioning of subject, object and verb in clause. Old English did not use forms equivalent to "who, when, where" in relative clauses (as in "The man whom I saw") or subordinate clauses ("When I got home, I went to sleep"). Instead, relative clauses used one of the following: Preposition-fronting ("The man with whom I spoke") did not normally occur. Subordinate clauses tended to use correlative conjunctions, e.g. The word order usually distinguished the subordinate clause (with verb-final order) from the main clause (with