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; 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

Example Sentences

Clark, who initially thought their meeting would be brief, was invited to a private audience, along with his mum and the director of the documentary.

From BBC • Apr. 2, 2026

"The new arrival is already able to walk around on its own but, like all baby anteaters, prefers the safety of mum for now."

From BBC • Apr. 1, 2026

They are entitled to about 20 hours of care a week but outside that, the responsibility falls almost entirely on him and Sophia's mum.

From BBC • Mar. 31, 2026

Darren, and Sophia's mum Amanda, were so shocked and devastated at the news that they threw up in the street outside the hospital.

From BBC • Mar. 31, 2026

“Finally, I told my mum how bad it was, and she let me change schools.”

From "Clairboyance" by Kristiana Kahakauwila

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