How to Read “Be used by one’s mouth”
Kuchi ni tsukawareru
Meaning of “Be used by one’s mouth”
“Be used by one’s mouth” means that your words or your name get used by others for their own convenience. They turn what you said into an excuse or justification for their actions.
This proverb applies to two main situations. First, when someone casually mentions something, and another person quotes it to justify their own argument.
Second, when your name or position gets used as a tool to excuse or justify someone else’s actions, completely apart from your actual intentions.
This expression captures more than just being “used.” It emphasizes the helplessness and frustration of being treated like a tool, completely separate from your own will.
Even today, this feeling is easy to understand. Your comments in a meeting get interpreted to suit someone’s agenda. Your social media posts get quoted without context.
Your words leave your control and take on a life of their own. This short phrase perfectly captures that frightening reality.
Origin and Etymology
No clear written records explain the origin of this proverb. However, the structure of the phrase itself offers interesting insights.
“Be used by one’s mouth” likely emerged as a reversal of the active phrase “use one’s mouth.” Normally, people choose their words deliberately and use their mouth to speak with intention.
But this expression flips to the passive form. The subject and object reverse positions entirely.
This reversal reflects a unique aspect of Japanese language and thinking. Your own words or name somehow become tools for others to manipulate.
The phrase expresses this as if your “mouth” operates independently and controls you instead.
Some scholars suggest this saying emerged during the Edo period among townspeople. It expressed the subtle dynamics of human relationships.
In business and social interactions, people have always experienced their statements being used in unexpected ways or turned into excuses.
This phrase captures words being treated as tools through its passive construction. It reveals both wariness about relationships and insight into the dangerous nature of language itself.
Usage Examples
- He got his project approved by letting my opinion be used by his mouth
- That person always quotes others in a way that lets their statements be used by his mouth, twisting everything to suit his purposes
Universal Wisdom
“Be used by one’s mouth” reveals the dual nature of language. Words should be tools for expressing your intentions. Yet they can also become chains that bind you.
This paradox tells us much about the complexity of human society.
Why do people use others’ words? They want to give their arguments authority and legitimacy. Quoting someone strengthens your position.
But this practice carries danger. The original speaker’s true meaning and context get ignored. Only convenient parts get extracted and used.
This proverb has endured because it addresses an eternal dilemma in human relationships. We must speak to live in society. Yet once spoken, words leave our control.
They can always be used in unexpected ways.
Our ancestors understood this unavoidable risk. Words stop being fully yours the moment you speak them.
This truth held in the age of face-to-face conversation. It holds equally in our era of instant information spread.
As long as humans use language, this tension will continue.
When AI Hears This
Information theory teaches that transmitted information cannot be recalled. Once a signal enters the communication channel, it spreads beyond the sender’s control.
“Be used by one’s mouth” describes exactly this irreversibility constraining human behavior.
The relationship is fascinating. The more information your words contain, the less freedom you retain. A specific promise like “I’ll definitely come at 10 tomorrow” specifies time and action precisely.
It carries high information content. In Shannon entropy terms, vague expressions maintain broad possibilities and high entropy. Specific promises limit options and create low entropy.
Clear statements reduce the uncertainty of your future actions.
Information’s copying and spreading nature adds another layer. Promise something to ten people, and that information exists as ten copies in the environment.
Correcting it requires ten times the energy. Social media posts cannot be erased because information copies multiply endlessly.
Words should convey your intentions. But once transmitted, they exist as independent information. They gain binding power that guides you toward specific behavior patterns.
The sender becomes the receiver. This reversal phenomenon captures the essence of “be used by one’s mouth.”
Lessons for Today
“Be used by one’s mouth” teaches you about responsibility and caution with words. But this is not a passive lesson about staying silent for safety.
Rather, this proverb teaches awareness when speaking. Understand that your words might take on their own life. Then choose clear expressions that resist misunderstanding.
When your statements might be quoted later, take steps to preserve your original intent. Keep records. Make context clear.
This proverb also questions your role as a listener. When you quote others, do you respect their true meaning and context?
Do you extract only convenient parts to support your own arguments?
In modern society, social media statements often get extracted and spread widely. This makes sincerity in handling words essential for both senders and receivers.
Protect your words from being used by others’ mouths. And avoid using others’ mouths yourself.
This two-way awareness becomes the key to building healthy communication.


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