Achilles heel

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Other spellings[change]

Noun[change]

Singular
Achilles heel

Plural
Achilles heels

  1. (idiom) (countable) An Achilles heel is a character's, person's, or thing's weakness or defect.
    The play's Achilles heel was the bad plot.
  2. (anatomy) The Achilles heel is also the Achilles tendon; tendo Achillis.