Achilles heel

Other spellings

• Achilles' heel

Noun

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.