難解難分 nán jiě nán fēn

DEFINITIONS

  1. hard to untie, hard to separate (idiom); inextricably involved
  2. locked in battle

CHARACTERS

難 nán difficult, arduous, hard; unable
解 jiě loosen, unfasten, untie; explain
難 nán difficult, arduous, hard; unable
分 fēn divide; small unit of time etc.