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  What it means

  Literally “to lie at the foundations,” this idiom means to underlie something — to be the root cause, the driving principle, or the fundamental basis of a phenomenon. It is used in analytical, explanatory contexts when identifying what is behind a problem, decision, or process. “Co leży u podstaw tego konfliktu?” — What underlies this conflict? “Brak zaufania leży u podstaw ich rozstania” — Lack of trust lies at the root of their separation.

  Vocabulary

  • leżeć — to lie (be located), to rest (imperfective — here used metaphorically)
  • u — at, by, near (preposition + genitive)
  • podstaw — foundations, bases (genitive plural of podstawa)
  • podstawa — base, foundation, basis

  Grammar note

  The preposition 'u' governs the genitive case, so 'podstawa' (base) becomes 'podstaw' (genitive plural). The spatial metaphor — something lying beneath the foundations — is extended to abstract causality. 'Leżeć' is imperfective, expressing a stable, ongoing state. The phrase is always followed by a genitive phrase specifying what it underlies: 'u podstaw czegoś' (at the foundations of something).

  Cultural context

  This is a formal, analytical expression found primarily in academic writing, journalism, and professional discussion — not in casual conversation. It is the idiomatic way to express 'to be at the root of' in formal Polish. In speech, Poles would more likely say 'wynika z' (results from) or 'pochodzi z' (comes from).

  Intermediate

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