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  What it means

  Literally ‘Achilles’ heel,’ this idiom refers directly to the Greek myth: Achilles was invulnerable everywhere except his heel, where he was ultimately killed. In Polish (as in English), it describes a single critical weakness in an otherwise strong person, plan, or system. ‘Jego piętą achillesową jest matematyka’ means ‘His Achilles’ heel is mathematics.’ It is used in both everyday conversation and formal analysis.

  Vocabulary

  • pięta — heel (feminine noun)
  • achillesowy — Achilles' (adjective, from the proper noun Achilles)
  • piętą achillesową — Achilles' heel (instrumental case in predicative position)

  Grammar note

  'Pięta achillesowa' is a noun phrase in the nominative. When used predicatively with 'być' (to be), it shifts to the instrumental: 'Jest jego piętą achillesową' (It is his Achilles' heel). The adjective 'achillesowy' agrees with 'pięta' in gender (feminine), number (singular), and case. Capitalizing 'achillesowy' is optional in Polish.

  Cultural context

  A borrowing from classical mythology that is fully assimilated into Polish. It is used across all registers — from casual conversation to academic writing and sports commentary. Its meaning is identical to the English 'Achilles' heel,' making it one of the most internationally transparent Polish idioms.

  Beginner

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