mum

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everyone and their mum

A large number or a majority of people. Used hyperbolically. Primarily heard in UK. I don't really want to get an iPhone. Everyone and their mum has one these days.
See also: and, everyone, mum

everybody and his mum

Used hyperbolically to express a large number or a majority of people. Primarily heard in UK. I'm so jealous, everybody and his mum is going on a vacation this summer except for me.
See also: and, everybody, mum

everybody and their mum

Used hyperbolically to express a large number or a majority of people. Primarily heard in UK. I'm so jealous, everybody and their mum is going on a vacation this summer except for me.
See also: and, everybody, mum

everyone and his mum

Used hyperbolically to express a large number or a majority of people. Primarily heard in UK. I'm so jealous, everyone and his mum is going on a vacation this summer except for me.
See also: and, everyone, mum

keep mum

To remain silent; to not say anything (e.g., about a secret). Make sure you kids keep mum in there or you're both grounded! You have to keep mum about Dave's retirement party—we want it to be a surprise.
See also: keep, mum

mum's the word

A request or pledge to keep something a secret. Now, I don't want anyone to know that I'm pregnant yet, so mum's the word. Your secret is safe with me. Mum's the word.
See also: word

Mum's the word.

Fig. a pledge not to reveal a secret or to tell about something or someone. "Mum's the word," said Jane to ease Mary's mind about her secret.
See also: word

mum's the word

Say nothing about this, it's a secret, as in Mum's the word on tonight's surprise party. This expression dates from about 1700, but mum, meaning "silence," is much older. In 2 Henry VI (1:2) Shakespeare wrote, "Seal up your lips, and give no words but mum."
See also: word

keep mum

remain silent about something; not reveal a secret. informal
See also: keep, mum

mum's the word

say nothing; don't reveal a secret. informal
In both of these idioms, mum stands for an inarticulate sound made with pursed lips indicating either unwillingness or inability to speak.
1991 Atlantic City Mum's the word on who will play the major figures in this tale of woe.
See also: word

keep ˈmum

(informal) say nothing about a secret; stay silent: I just kept mum when she asked me where Ben was. She’d be furious if she knew.Please will everyone keep mum about Saturday. We want to give them a real surprise. OPPOSITE: blow the gaff (on somebody/something)
See also: keep, mum

ˌmum’s the ˈword!

(informal) used for telling somebody to keep a secret or for telling somebody that you will keep a secret: ‘Nobody must mention this project outside the office. I hope that’s clear.’ ‘We understand, John. Mum’s the word!’
These two idioms refer to the sound you make when your mouth is closed.

mum's the word

Say nothing of the secret you know: Mum's the word on the surprise party.
See also: word