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Achilles' Heel

Achilles' Heel.

English
idiom

The one weak point in someone who is very strong.

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What it means...

One weak point in a person or thing that is otherwise very strong.

An Achilles' heel is the single place where something reliable can still fail, and it often matters most.

The phrase comes from a Greek myth.

Use it when…

  • When one weakness undermines an otherwise excellent performance
  • When a strong product fails at a single stage
  • When someone talented has one consistent problem area

Don’t confuse with...

Wrong icon

"A Blind Spot"

—

A weakness you cannot see in yourself

Wrong icon

"A Chink in the Armor"

—

A small gap in an otherwise solid defense

Correct icon

"Achilles' Heel"

—

The one weak point in something strong

Where you’ll hear it

You’ll hear the "Achilles' Heel" idiom in real life — at work, in relationships, or in the media.

Work & Business

Management

The review noted that documentation was the department's Achilles' heel despite excellent delivery times.

Relationships & Social Life

Friends

His friends joke that punctuality is his Achilles' heel, since he organizes everything else perfectly.

Media & Everyday Life

News

Analysts described the country's aging power grid as the Achilles' heel of its otherwise fast-growing economy.

Use it like this

Here’s how to use "Achilles' Heel" idiom naturally in real conversations, with real examples.

Work & Business

Giving feedback

You

Your writing is excellent — proofreading is the Achilles' heel we should work on.

Colleague

I'll start reading everything aloud before I send it. That usually catches things.

Relationships

Giving advice

Friend

I train hard all week and then eat terribly every weekend.

You

The weekends are your Achilles' heel. Fix those and the rest already works.

Everyday Conversations

Describing events

Friend

How did such a good team lose that badly?

You

Defending corners is their Achilles' heel, and the other side knew it.

Last updated:
October 4, 2026

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