竭盡全力

竭尽全力
jiéjìnquánlì
(idiom) to spare no effort; to do one's utmost

CEDICT

Entry Composition

1 竭盡 jiéjìn to use up; to exhaust
2 全力 quánlì
  1. with all one's strength
  2. full strength
  3. all-out (effort)
  4. fully (support)