势不两立 shì bù liǎng lì

DEFINITIONS

  1. the two cannot exist together (idiom); irreconcilable differences
  2. incompatible standpoints

CHARACTERS

势 shì power, force; tendency
不 bù no, not; un-; negative prefix
两 liǎng two, both, pair, couple; ounce
立 lì stand; let stand; establish, set