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  What it means

  Literally “to lie at the foundations,” this idiom means to be the fundamental cause, root, or basis of something. It is used in analytical or explanatory contexts when identifying what underlies a problem, phenomenon, or idea. For example, one might say that economic inequality “leży u podstaw” of social unrest — meaning it is the core driver. The phrase is formal in register and common in journalism, academic writing, and intellectual discussion.

  Vocabulary

  • leżeć — to lie (to be situated/positioned)
  • u — at, by (preposition taking genitive)
  • podstaw — foundations, bases (genitive plural of 'podstawa' — base, foundation)
  • podstawa — foundation, basis, base

  Grammar note

  The preposition 'u' requires the genitive case. 'Podstawa' (feminine noun) becomes 'podstawy' in the singular genitive, and 'podstaw' in the plural genitive — the form used here. The verb 'leżeć' is imperfective and typically appears in the third person: 'leży u podstaw' (it lies at the foundations of). The full construction is 'leżeć u podstaw czegoś' — where 'czegoś' is the genitive of whatever is being grounded or explained.

  Cultural context

  This is a formal, written-register expression common in Polish journalism, academic texts, and political commentary. It is the equivalent of English phrases like 'lies at the heart of,' 'underpins,' or 'is at the root of.' It is not used in casual speech — using it in everyday conversation would sound overly intellectual or pompous.

  Intermediate

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