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比喻趁人有危难时加以陷害，例他平时呼朋唤友，可是一旦友人有了急难，不但不救，反而落井下石。
When all is going well，he never hesitates to call on his friends for help．When a friend falls on hard times，however，he makes no attempt to help him but drops so low as to take mean advantage of him．
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