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• Achilles heel
  Achilles heel

  noun

  a portion, spot, area, or the like, that is especially or solely vulnerable.
• Achilles' heel
  Achilles' heel

  A point of vulnerability. (See Achilles.)

Achilles heel

American  

Or Achilles' heel

noun

1. a portion, spot, area, or the like, that is especially or solely vulnerable.

   His Achilles heel is his quick temper.

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Achilles heel British  

noun

1. a small but fatal weakness

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Achilles' heel Cultural  

1. A point of vulnerability. (See Achilles.)

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Achilles' heel Idioms  

1. A fatal weakness, a vulnerable area, as in This division, which is rarely profitable, is the company's Achilles' heel. The term alludes to the Greek legend about the heroic warrior Achilles whose mother tried to make him immortal by holding the infant by his heel and dipping him into the River Styx. Eventually he was killed by an arrow shot into his undipped heel. [c. 1800]

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Etymology

Origin of Achilles heel

First recorded in 1800–10

Example Sentences

As a wealthy institution in receipt of public funding, money has always felt like an Achilles heel for the royals - and deeper scrutiny of their finances will be uncomfortable for them.

From BBC • May 14, 2026

Even China’s imports of crude, previously an Achilles heel given its heavy dependence on energy to fuel its economy, dropped 8.8% as electric vehicles continue to dominate the market for autos domestically.

From MarketWatch • Jan. 14, 2026

“You have spontaneous multiple events, which is the Achilles heel of any operation,” he said.

From Los Angeles Times • Jun. 12, 2025

"We discovered an Achilles heel of antibiotic resistant bacteria," said Süel, a member of the Department of Molecular Biology at UC San Diego.

From Science Daily • Nov. 16, 2024

“An Achilles heel is a weakness, and you’ve got one.”

From "The Million Dollar Shot" by Dan Gutman