We found 12 dictionaries that define the word mum's the word:

General (10 matching dictionaries)

1. mum's the word: Merriam-Webster
2. mum's the word: Oxford Learner's Dictionaries
3. mum's the word, mum's the word: Collins English Dictionary
4. mum's the word: Wordnik
5. Mum's the word: Cambridge Advanced Learner's Dictionary
6. mum's the word: Wiktionary
7. mum's the word, mums the word: Dictionary.com
8. Mum's the Word, Mum's the Word (film), Mum's the word: Wikipedia, the Free Encyclopedia
9. mum's the word: TheFreeDictionary.com
10. Mum's the word: Phrase Finder

Miscellaneous (1 matching dictionary)

11. Mum's the word: Idioms

Slang (1 matching dictionary)

12. mum's the word, mums the word: Urban Dictionary

Definitions from Wikipedia (Mum's the word) ▸ noun:  a popular English idiom. ▸ Words similar to mum's the word ▸ Usage examples for mum's the word ▸ Idioms related to mum's the word ▸ Wikipedia articles (New!) ▸ Words that often appear near mum's the word ▸ Rhymes of mum's the word ▸ Invented words related to mum's the word