mum's the word

idiom

Definition of mum's the word

informal
used to say that some information is being kept secret or should be kept secret We want her birthday party to be a surprise, so mum's the word.

Learn More About mum's the word

Dictionary Entries Near mum's the word

mum

mum's the word

Mumbai

See More Nearby Entries 

Statistics for mum's the word

Cite this Entry

“Mum's the word.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mum%27s%20the%20word. Accessed 19 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Name that Thing: Flower Edition

Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!