Skip to main content
to keep mum

to keep mum

3 7.5
Stay quiet about something private
  • phrasal verb
  • Informal
translation icon : guardar silencio
  • Told you to keep mum, Sid.

Examples

  • I decided to keep mum nevertheless.

    Blog text (21)
  • Now, I told that little rapscallion to keep mum about this whole affair.

  • How many of his colleagues might also be receiving these pictures, or pictures like them, and keeping mum about it?

    Fiction book (2001)
  • In fact, there are major advantages to having the doc keep mum.

    Blog text (32)
  • The Texas Transportation Commission is keeping mum on its decision to approve the speed, notes the Los Angeles Times.

    Blog text (13)
  • Because what we're learning now is the kind of things that were known only to the McCain/Palin campaign, and of course they kept mum about it because they wanted to win.

    Blog text (13)
  • A Time magazine reporter got access to the data scientists in the campaign's Chicago headquarters on the condition that the reporter would keep mum until after the election.

    Blog text (9)
  • I have to keep mum on the matter—conflict of interest—but there's more than enough support already.

    Fiction book (1992)
  • If your friends ask you about the surprise party, you should keep mum to keep it a secret.

  • During the investigation, the witness decided to keep mum rather than share what he knew.

Synonyms

to shut up
vsto keep mum
  • Offensive
4.1

Tell someone to be quiet in a rude or angry way

is about staying silent or protecting information without rude abrupt force
to be quiet
vsto keep mum
231 1.0

To stop making noise or talking

is more about withholding information and protecting secrets rather than only reducing noise
to keep one's mouth shut
vsto keep mum
  • Informal
116 5.6

To say nothing to avoid trouble or keep a secret

is about choosing silence to avoid revealing secrets rather than specifically avoiding trouble
to keep quiet
vsto keep mum
90 2.5

To say nothing or not tell a secret

focuses more on keeping information secret rather than general silence
to keep a secret
vsto keep mum
76 2.6

To not tell anyone private information

is about staying silent in general rather than specifically protecting confidential facts
to clam up
vsto keep mum
  • Informal
14 6.6

Stop talking suddenly because you are nervous or do not want to say anything

is deliberate silence that may aim to hide information rather than nervous shutting down
to close up
vsto keep mum
10 4.8

To stop talking and say nothing

is chosen silence meant to protect information rather than an unwilling sudden stop
to shut one's mouth
vsto keep mum
  • Informal
4 4.4

To stop talking to keep a secret or when told to be quiet

is about choosing silence to avoid revealing secrets rather than obeying orders
to button up
vsto keep mum
  • Informal
3 7.1

To stop talking suddenly and not answer questions

is broader and includes silent choice over time not only abrupt stops
to keep shtum
vsto keep mum
  • Slang
1 9.9

To stay silent on purpose to avoid trouble

covers silence for various reasons not only to avoid trouble
to untell
vsto keep mum
1 9.9

To choose not to tell a fact or story

is staying silent generally rather than specifically withholding a particular story
to button one's lip
vsto keep mum
  • Informal
7.2

To keep quiet on purpose and not tell others

is the same idea but may include silence without intentional control
to keep one's cakehole shut
vsto keep mum
  • Offensive
9.9

Not say anything or tell other people

is the neutral expression for keeping silence without coarse wording
to dummy up
vsto keep mum
  • Archaic
9.6

Refuse to speak or suddenly stop talking when asked

is about staying silent to avoid revealing secrets rather than refusing to answer
to belt up
vsto keep mum
  • Offensive
9.2

To tell someone to stop talking and be quiet

is a neutral phrase for staying silent and not a blunt order

Antonyms

2.3

Show something that was hidden or secret

220 3.4

To say your opinion or feelings openly even when it is difficult

How Silent

to keep mum
  • Informal
3 7.5
to be quiet
231 1.0

Surface Forms

keep mum infinitive
keeping mum present participle
keeps mum third person singular
kept mum past
kept mum past participle

Morphology

keep + mum

The meaning 'to remain silent' follows directly from combining 'keep' (to continue or maintain) with 'mum' (silence), so a learner who knows both constituents can infer the phrase meaning. The construction is a straightforward keep + noun collocation and is cross-linguistically transparent in logic, making it readily comprehensible at B1 level.

Etymology

Keep mum may come from the 'mmm' sound people make with closed lips when they want to be quiet, so mum came to mean being silent. That's why keep mum means 'to stay quiet' and not tell a secret.