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不遗余力
Leave no avenue unexplored.
Leave no stone unturned.
Go to all lengths.
Tooth and nail.
Move heaven and earth.
eg：He will support you for all he is worth.
中英俚语俗语来源：战国策：“王曰，秦之攻我也，不遗余力矣，必以倦而归也。”
同义词：全力以赴 At full steam.
反义词：袖手旁观 Stand by with folded arms.
