mum

¹ American  

[muhm] / mʌm /

adjective

1. silent; not saying a word.

   to keep mum.

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interjection

1. (used to demand immediate silence.)

idioms

1. mum's the word, do not reveal what you know (about something); keep silent.

   Mum's the word, or the surprise party won't be a surprise.

mum ² American  

[muhm] / mʌm /

Or mumm

verb (used without object)

mummed, mumming

1. to say “mum”; call for silence.

2. to act as a mummer.

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mum ³ American  

[muhm] / mʌm /

noun

1. chrysanthemum.

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mum ⁴ American  

[muhm] / mʌm /

noun

Chiefly British.

1. mom.

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mum ⁵ American  

[muhm] / mʌm /

noun

1. a strong beer or ale, first made in Brunswick, Germany.

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mum ⁶ American  

[muhm] / mʌm /

noun

Chiefly British.

1. madam.

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mum ¹ British  

/ mʌm /

adjective

1. keeping information to oneself; silent

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noun

1. silence or secrecy is to be observed

mum ² British  

/ mʌm /

noun

1. an informal word for mother 1

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mum ³ British  

/ mʌm /

verb

1. (intr) to act in a mummer's play

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mum ⁴ British  

/ mʌm /

noun

1. obsolete a type of beer made from cereals, beans, etc

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Usage

What does mum mean? Mum is an adjective that means keeping quiet. It can also be used by itself to mean Be quiet!This sense of mum is especially used in the expressions keep mum and mum’s the word. In the U. K. and other places, mum is used as a word for mom or madam. It’s also commonly used as a short way of saying chrysanthemum, a type of flower. Example: Mum’s keeping mum—I can’t get a word out of her!

Etymology

Origin of mum¹

First recorded in 1350–1400; Middle English momme; imitative

Origin of mum²

First recorded in 1350–1400; Middle English mommen, verb use of mum ¹; compare Middle Dutch mommen ”to act the mummer's part”

Origin of mum³

First recorded in 1890–95; shortened form

Origin of mum⁴

First recorded in 1815–25; nursery word; see mom

Origin of mum⁵

First recorded in 1630–40; from German Mumme, said to have been named after Christian Mumme, the brewer who made it

Origin of mum⁶

Variant of ma'am

Explanation

Someone who's mum has nothing to say, especially on a particular subject. If you agree to keep someone's secret, you could tell them, "Mum's the word!" A shy child who's new at school might stay mum all day, and even your most talkative friend might remain mum on controversial topics like religion and politics. In many parts of the world, mum is also a nickname for your mother — and it's also a nickname for the flower called a chrysanthemum. The "quiet" meaning of mum comes from Old English, inspired by the "mmm" sound you make when your lips are closed.

Example Sentences

"Are you tired from work and study lately? Don't push yourself too hard. Mum and Dad know that you have endured a lot."

From BBC • Jun. 13, 2026

"Our Mum looked for Seamus right up until the day that she died," they added.

From BBC • May 26, 2026

Unlike Look Mum No Computer, who is best known for a YouTube channel where he builds eccentric contraptions, Dara is a major pop star in her home country.

From BBC • May 17, 2026

Rhi, who shares her experiences in a blog called "A Mum from the 'Diff" and voluntarily runs the Masic Foundation support group in south Wales, said there was "embarrassment" talking about such an intimate area.

From BBC • May 13, 2026

Mum is in the hall holding something out to me.

From "Code Name Kingfisher" by Liz Kessler

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