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济河焚舟cross the river and burn the ship -- to show one's determination to fight to the last;draw the sword and throw away the scabbard ;
卸磨杀驴kill the donkey the moment it leaves the millstone -- get rid of sb. as soon as he has done his job;slaughter the donkey after it has done its job at the mill;kick down the ladder ;
见利忘义forget honour at the prospect of profits;disregard moral principles in pursuit of profit;forget all moral principles at the sight of profits;forget friendship for profit ;
鸟尽弓藏cast aside the bow once the birds are gone -- cast sb. aside when he has served his purpose;The bows and arrows are put away when there are no more birds to shoot -- kick out sb. after his services are no longer needed. ;
得鱼忘筌forget the means by which the end is attained;forget the trap as soon as the fish is caught ;
忘恩负义devoid of gratitude;be ungrateful and act contrary to justice;be ungrateful and leave one's benefactor in the lurch;be ungrateful and treacherous;ungratefulness ;
上树拔梯to dupe a person and then pull the ladder from under him;
兔死狗烹When all hares are killed, the hounds will be stewed and eaten.;After the cunning hare is killed, the hound is boiled.;Cook the hounds when no longer needed after the hares have been run down.;slay the lackeys when they have outlived their usefulness ;