裡勾外連 lǐ gōu wài lián

DEFINITIONS

  1. to act from inside in coordination with attackers outside
  2. attacked from both inside and out

CHARACTERS

裡 lǐ inside, interior, within
勾 gōu
HSK 6
hook, join, connect; entice
外 wài
HSK 2
out, outside, external; foreign
連 lián join, connect; continuous; even