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

everyone and their mum

Used hyperbolically to express a large number or a majority of people. Primarily heard in UK. I'm so jealous, everyone and their 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
Farlex Dictionary of Idioms.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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
The American Heritage® Dictionary of Idioms by Christine Ammer.

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
Farlex Partner Idioms Dictionary

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.
Farlex Partner Idioms Dictionary

mum's the word

Say nothing of the secret you know: Mum's the word on the surprise party.
See also: word
American Heritage® Dictionary of the English Language, Fifth Edition.

mum's the word

Keep it a secret. This seemingly modern slang phrase was used by Shakespeare—“Seal up your lips, and give no words but—mum” (HenryVI, Part 2, 1.2)—as well as numerous earlier writers. The word mum has meant silent since about 1350 and comes from the imitative sound made when one’s lips are closed (a kind of hum). The actual locution “Mum’s the word” appears in print over and over from about 1700.
See also: word
The Dictionary of Clichés by Christine Ammer
See also:
  • everybody and his mum
  • everybody and their mum
  • everyone and his mum
  • everyone and their mum
  • everybody and his mother
  • everybody and their mother
  • everybody and their brother
  • everybody and their dog
  • everybody and his dog
  • everybody and his uncle
References in periodicals archive
One in seven school gates now also has a 'handbag dog mum' who carries a tiny but expensive teacup dog in a designer handbag, alongside one in four 'vegan eco mums'.
From group walks and swimming trips to their weekly coffee groups on Tuesdays in Wigan and Thursdays in Bamber Bridge, MUM is flying.
After learning the news of her mum's engagement, Molly-Mae pressed her forehead against her mum's while they hugged, before planting a big kiss on her lips.
Maxine Grant, 38, who is mum to Indie Mae Grant, four, is joining the ride, too.
co.uk/ Curphey said that she argued with staff at the hospital who wanted to discharge her mum. She said: "Mum was sitting by her bed.
PRANKS A LOT, MUM David Walliams joked of this pic with Kathleen: "Don't know who this woman is"
ModelDaisy Lowecosied up to her mum Pearl and half-sister Betty, with the trios flashing winning smiles at snapper Rankin.
"We all know mums like mine and as a group of businesses based in Dumfries, we wanted to take the opportunity to treat a special mum in our community in celebration of all mums."
Me: *Flicks channels wildly* Mum: Oh look, Jane Fonda's on the telly, let's watch this.
POSITIVE ROLE-MODELS MANY mums (75%) are calling for advertisers to use more realistic mum body images in commercials, including ditching images of bikini-clad new mums with taut stomachs on the beach.
Two businesswomen came up with an innovative solution after noticing the problems of maternal unemployment and small firms being unable to afford full-time social media managers Rhondda Valley-born Kathryn Tyler and her colleague Nikki Cochrane founded Digital Mums in 2014.
Now, more than three years after her mum's death - and in the week Hollywood star Angelina Jolie revealed she had her ovaries removed to prevent cancer - Claire says her mum's illness may have saved the lives of her and her aunts.
The "2014 Asian Digital Mum" survey also revealed that mothers increasingly use their phones to check email, visit parenting sites and use social media, and are the primary purchase decision-makers of their households.
Natalie Shepherd Gilbert, 32, from Gosport, Hants, is mum to four-year-old Harry.
Nearly half of the younger mums said they made more of an effort to learn traditional 'mum skills' after their children were born - yet despite this, less than a third could make pastry, only 38% could bake a pie and just 23% could knit.