His MOUTH runs over

Insights

Excessive Talking

The most common interpretation is that the person talks excessively and without restraint. Their words spill out uncontrollably, indicating they are garrulous or verbose.

Inability to Keep Secrets

This suggests an inability to keep secrets or confidences. Like an overfilled cup, the mouth cannot contain what is put into it, and information inevitably spills out. This person is a gossip or a 'blabbermouth'.

Unrestrained Expression

The proverb can also describe someone who is unrestrained in their emotional expression. Their boasts, complaints, or praises 'run over', showing a lack of verbal moderation and self-control.

Cultural Value of Discretion

The proverb taps into a deep-seated social value for verbal discretion and control. In many cultures, the ability to 'hold one's tongue' is a sign of wisdom and trustworthiness, making its opposite—the 'running over' mouth—a mark of foolishness or unreliability.

Psychology of Impulsivity

Psychologically, the phrase points to a lack of self-regulation or impulsivity. It suggests a person whose thoughts translate into speech without a filter, often driven by a need for attention, anxiety, or a simple inability to gauge social appropriateness.

Universal Metaphor of Excess

The image of an overflowing vessel is a timeless and cross-cultural metaphor for excess. By applying it to the mouth, the proverb makes the abstract flaw of verbosity or indiscretion tangible and immediately understandable.

Rhetorical Devices

Metaphor

The core of the proverb is a powerful metaphor comparing the mouth to an overflowing container, vividly translating the abstract concept of excessive speech into a concrete, physical image.

Imagery

The phrase evokes strong sensory imagery of spillage and uncontrolled flow, effectively conveying the sense of excess and lack of restraint associated with the person's speech.

Synecdoche

The use of 'mouth' stands in for the person's entire capacity for speech and their character flaw of being indiscreet. This conciseness makes the proverb sharp and memorable.