The neuroscience of dead metaphors — and why one wrong word in a meeting can derail everything.

Welcome to edition four of our weekly newsletter. Every Wednesday, one storytelling insight you can use straight away.

Last week we explored metaphors — the words and images that light the brain up, fire the motor cortex and create genuine emotional connection.

This week: what happens when a metaphor dies. And what happens when a living one goes badly wrong.

First, a question about your Monday morning

When did you last tell a colleague you had a deadline to meet?

Probably recently. It is one of the most common words in professional life. We schedule around deadlines, stress about deadlines, negotiate deadlines. We use the word without thinking.

Here is what almost nobody knows about it.

The word deadline was born in one of the most horrific places in American history. Andersonville Prison, Georgia, during the Civil War. Confederate commander Henry Wirz placed a literal line of wooden planks twenty feet inside the outer prison walls. The order to guards was simple and absolute: any prisoner who crossed that line, even by a hair, was to be shot on sight. Without warning.

It was a line. And crossing it meant death.

The word first appeared in an official military report in July 1864, in the report of Confederate Inspector-General Colonel D.T. Chandler, describing the conditions at Andersonville Prison. Within decades it had migrated into newspaper printing, then into everyday professional language. Today it sits in every project plan, every email, every school assignment in the world.

And nobody flinches.

That is exactly what happens to a dead metaphor. The image dies. The word stays. And the power it once carried disappears completely.

What neuroscience tells us

Fresh, vivid metaphors do something remarkable in the brain. When you read or hear an action-based metaphor — “grasp the idea,” “bend the rules,” “carry the weight” — EEG studies show near-immediate activation of the sensory-motor region. Research suggests that region of the brain is critically important in comprehension — the brain does not just process the meaning, it simulates the experience.

Dead metaphors do the opposite. Research by Lisa Aziz-Zadeh at the University of Southern California found that familiar idioms like “biting off more than you can chew” produced no activation of the motor cortex at all. The brain treats them as frozen blocks of abstract language. No image. No simulation. No emotional response.

Your audience has stopped feeling your words. They are just processing them.

For a communicator, a leader, a coach or a presenter, that is a serious problem. If the brain is not simulating your language, it is not connecting with it. And if it is not connecting, it is not remembering.

One word. Two completely different decisions.

In 2011, researchers Paul Thibodeau and Lera Boroditsky at Stanford University published a study in PLOS ONE that should change how every communicator thinks about word choice.

They gave participants a report about rising crime in a fictional city and asked them to propose a solution. For half the participants, crime was described as a beast preying on the city. For the other half, as a virus infecting it. The rest of the report — all the statistics, all the facts — was identical.

When crime was framed as a beast, participants overwhelmingly proposed catching and jailing criminals, hiring more police, enforcing harsher laws. When crime was framed as a virus, they proposed investigating root causes, improving education, treating the problem at its source, prevention.

One word. Two entirely different approaches to solving the same problem.

The effect of the metaphorical framing was larger than pre-existing differences in opinion between Democrats and Republicans. And here is the part that stays with me: when participants were asked what had most influenced their decision, almost none of them pointed to the metaphor. They cited the statistics instead — which were identical in both versions.

The metaphor was doing the work invisibly. The people it influenced had no idea.

This is not a curiosity from a psychology lab. This is your next team meeting. Your next presentation. Your next difficult conversation with a client or a direct report.

The metaphor you choose is not decoration. It is the frame through which your audience will understand everything that follows.

The words you use every day that used to mean something else entirely

Dead metaphors are everywhere once you start looking.

Time is running out. Originally referred to sand running through an hourglass. Time literally, physically ran out of the top bulb into the bottom. Today we say it in meetings and nobody pictures sand. Nobody pictures anything.

Brainstorm. Originally a medical term for a sudden and violent disturbance in the brain. A neurological event. Now it means a meeting where people write on Post-it notes.

Falling in love. Once visceral and slightly dangerous — the loss of control, the surrendering of ground. Now it is simply what people do.

Linguists call this process semantic shift. A metaphor gets used so often that its original image fades completely. What remains is a word emptied of its picture — a frozen metaphor, a historical metaphor, a dead one. plos

When a metaphor does not just die — it backfires

Dead metaphors are invisible. That is their problem. But some metaphors are very much alive in the mind of the listener — just not in the way the speaker intended.

I have been in meetings where a manager referred to “keeping the ducks in a row” while the team members she was referring to were sitting right there in the room. In that moment, the metaphor did not land flat. It landed badly. Because for the people in those seats, being described as ducks to be organised was not neutral. It was diminishing. The image was very much alive — just not the image the manager thought she was creating.

Then there is “cultural landmines” — a phrase I have come across recently in professional contexts. I understand what it means: the invisible traps of acting inappropriately in an unfamiliar cultural environment. The intention is clear. But here is what my brain does with it anyway. A landmine. Pressure. An explosion. Body parts. That image does not stay abstract. It arrives, vivid and violent, before the intended meaning has had a chance to follow.

The speaker meant caution. The listener’s brain pictured carnage.

This is the hidden danger of reaching for a dramatic metaphor without checking what it actually conjures. The brain is not polite about this. It takes the image literally first, and searches for the intended meaning second — if at all.

Why this matters for how you communicate

If you lead a team, present to clients, coach individuals or speak in public, metaphors are working on your audience whether you choose them deliberately or not.

Every time you say “let us circle back,” “move the needle,” “low-hanging fruit” or “think outside the box,” your audience’s brain registers the meaning and nothing else. No image fires. No emotion stirs. The words land flat.

Every time you reach for a dramatic metaphor without considering what it conjures — war, violence, death, animals — you risk creating an image your audience cannot unhear.

The fix is simple in principle.

Before your next presentation or important conversation, ask two questions about every metaphor you plan to use. First: is this metaphor still alive, or has it been used so often that the image is gone? Second: if it is alive, what image does it actually create — and is that the image I want?

Instead of “let us move the needle,” try “let us shift something that has not moved in years.” Instead of “cultural landmines,” try “invisible thresholds” or “unwritten rules.” The meaning is the same. The image is safer and more precise.

One last thought

We use the word deadline every week. Nobody gets shot anymore for crossing one.

But the next time someone tells you they have a deadline to meet, you will know something they do not. That word was once a line in the dirt. And crossing it cost everything.

Language carries history. The words we reach for without thinking were once chosen very deliberately by someone, somewhere, to describe something real.

Choose yours carefully.