難解難分 [难－难－]

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Definitions (CC-CEDICT)
  1. hard to untie, hard to separate (idiom); inextricably involved
  2. locked in battle
Definitions (Wiktionary)
  1. phrase, idiomatic, of a romantic couple
    to be intimate and inseparable
  2. phrase, idiomatic
    to be locked in a stalemate in a fight or struggle