攻關

攻关
gōngguān
  1. to storm a strategic pass
  2. fig. to tackle a key problem

CEDICT

Entry Composition

1 攻 gōng
  1. to attack
  2. to accuse
  3. to study
  4. (LGBT) top
2 關 guān
  1. mountain pass
  2. to close; to shut; to turn off
  3. to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc)
  4. to concern; to involve