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to run off at the mouth

to run off at the mouth

3 8.4
Talk too much and say things you should not
  • idiom
  • Informal
translation icon : hablar sin parar
  • But I'm not sure that means he isn't capable of being foolish or running off at the mouth.

Examples

  • There I go running off at the mouth again.

    Fiction book (2000)
  • Since this is often the opening question in an interview, be extra careful that you don't run off at the mouth.

    Blog text (33)
  • Your dad likes to run off at the mouth sometimes, l know.

  • You run off at the mouth so.

  • Listen up instead of running off at the mouth!

    Fiction book (1997)
  • Now you're going to listen to me while I run off at the mouth.

  • A whole new problem is, you didn't bother to investigate before running off at the mouth.

    Blog text (32)
  • You catch me running off at the mouth, just give me a poke in the chops.

  • Vivien: You know you run off at the mouth, Clarence.

    Fiction book (1998)
  • He tends to run off at the mouth during meetings, often sharing too much information.

Synonyms

to rant
vsto run off at the mouth
  • Informal
70 4.8

To speak loudly and angrily for a long time

is focused on speaking too much and indiscreetly rather than angry speech
to spout
vsto run off at the mouth
  • Informal
63 5.2

To speak loudly and excitedly for a long time without much thought

is about excessive and indiscreet speech rather than emotional loudness
to run on
vsto run off at the mouth
  • Informal
38 5.0

To talk for a long time without stopping, often giving too many details

is more about speaking indiscreetly rather than only long speech
to mouth off
vsto run off at the mouth
  • Informal
28 8.3

To speak rudely and loudly to a person in charge

is more about excessive and indiscreet speaking than rude comments
to shoot one's mouth off
vsto run off at the mouth
  • Informal
5 8.0

To say things carelessly or proudly without thinking about the result

is more about talking too much and revealing private details
to shoot from the lip
vsto run off at the mouth
  • Informal
1 8.9

To speak quickly without thinking and risk upsetting people

is more about saying too much rather than only impulsive speech
to shoot off at the mouth
vsto run off at the mouth
  • Informal
1 9.4

Say things quickly without thinking that may hurt people or make you sorry later

is similar but also stresses saying more than is appropriate
to overtalk
vsto run off at the mouth
1 6.4

To talk so much that you stop others from speaking

is about saying too much rather than controlling who speaks
to overspeak
vsto run off at the mouth
7.5

To talk too much and say things you should not say

is more about saying things that are indiscreet or inappropriate
to shot from the lip
vsto run off at the mouth
  • Informal
9.9

To say something quickly without thinking

is focused on speaking excessively and indiscreetly rather than brief bluntness
to gassing
vsto run off at the mouth
  • UK
8.1

To talk a lot about unimportant things

is more indiscreet and possibly revealing rather than just chatty

Antonyms

1.0

Pay attention to sounds or speech to hear and understand them

231 1.0

To stop making noise or talking

How Talkative

to rant
  • Informal
70 4.8
to run off at the mouth
  • Informal
3 8.4
to ramble
  • Informal
48 5.3
to babble
75 4.4
to talk
1.0
to chat
  • Informal
269 1.0

Surface Forms

running off at the mouth present participle
runs off at the mouth third person singular
run off at the mouth past participle

Morphology

run + off + at + the + mouth

The noun 'mouth' gives a clear cue to speaking, so learners can guess the expression relates to talking, but the verb phrase 'run off at' is idiomatic and its contribution to 'excessive/indiscreet speech' is not directly predictable from the constituents. A B1 learner who knows the words might infer something about talking but would not reliably derive the precise meaning 'to speak excessively or indiscreetly' without prior exposure.

Etymology

The idiom run off at the mouth may come from the image of words like water that run off the mouth, spilling out without control. That's why it means 'to say too much'.