Meaning of the word "mum's the word" in English

What does "mum's the word" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mum's the word

US /mʌmz ðə wɜrd/
UK /mʌmz ðə wɜrd/
"mum's the word" picture

Idiom

1.

keep quiet; say nothing

Example:
Don't tell anyone about the surprise party, remember, mum's the word!
When it comes to our secret project, mum's the word.
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