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  What it means

  Literally “in a hidden way” or “in a concealed manner,” po kryjomu describes doing something secretly, stealthily, or without others’ knowledge. The phrase implies not just privacy but a deliberate effort to avoid detection — closer to “on the sly” or “behind someone’s back” than simply “privately.” Poles use it to describe everything from children sneaking sweets before dinner to adults conducting secret dealings. It carries a mild connotation of guilt or mischief.

  Vocabulary

  • po — in a ... manner (prepositional prefix forming adverbial phrases)
  • kryjomu — hidden, concealed (archaic dative form, used only in this fixed phrase)
  • po kryjomu — secretly, on the sly, covertly

  Grammar note

  The construction po + dative of a noun or adjective-derived noun is a common way to form adverbial phrases in Polish: po cichu (silently), po kryjomu (secretly), po ciemku (in the dark). The form kryjomu is an archaic dative and exists only in this fixed expression — it cannot be declined further or used independently.

  Cultural context

  Po kryjomu is neutral in register — not vulgar, not formal — and appears in both everyday speech and literary Polish. It is commonly paired with verbs like działać (to act), robić coś (to do something), or spotykać się (to meet), always implying that someone is actively hiding their actions from a third party.

  Intermediate

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