To exert all one's strength; to go all out.
竭尽用尽。用尽全部力量。
《三国志·魏志·贾逵传》裴松之注引《魏略》竭尽心力，奉宣科法。”
He ran with all his might to catch the bus.
Learn the next connected idiom: 竭尽全力 (jié jìn quán lì) → 力所能及 (lì suǒ néng jí)
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