run off at the mouth
The idiom "run off at the mouth" is commonly used to describe someone who talks excessively or without consideration.
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Definition
B2General
(informal, derogatory)To talk excessively, often without thinking about the consequences.
Example
- He tends to run off at the mouth during meetings, which annoys his colleagues.
- She ran off at the mouth and revealed the surprise party plans.
Similar
Terms that have similar or relatively close meanings to "run off at the mouth":
shoot off at the mouthspout offblab outtalk through one's hatgob offrun off onmouth offbig mouthfroth at the mouthtalk shitrun offspout outtalk trashrattle offwatch one's mouthbig talktalk outtell offspark outspill one's gutshold forthtalk shiteblow the gaffshit talkput words in someone's mouth