A wolf and a jackal often went hunting together. Once they came to a sheepfold the walls of which were firmly built and too high for them to get over. Then they had an idea: Since the wolf had long forelegs and short hindlegs while the jackal had short forelegs and long hindlegs, the wolf stood on the neck of the jackal, and the jackal stood up on its hindlegs. In this was the wolf climbed over the wall to where the sheep were.
狼和狈常常结伴出外伤害牲畜。有一次，狼和狈一起来到一个羊圈外面。羊圈很高，又很坚固，叼不走里面的羊。狼和狈就想了一个办法：因为狼的前脚长后脚短，狈的前脚短后脚长，狼骑在狈的颈上，狈用长长的后脚站起来，狼就用长长的前脚攀住羊圈，终于把羊叼走了。
This idiom is used to describe doing evil things in collusion with others.
“狼狈为奸”这个成语比喻坏人互相勾结起来干坏事。
Notes:
源于唐代段成式的《酉阳杂俎》。据说狼和狈是一类动物。狼的前腿长，后腿短；狈则相反，前腿短，后腿长。狈每次出去都必须依靠狼，把它的前腿搭在狼的后腿上才能行动，否则就会寸步难行。有一次，狼和狈走到一个人家的羊圈外面，虽然里面有许多只羊，但是羊圈既高又坚固，于是它们想出了一个好主意：让狼骑在狈的脖子上，再由狈用两条长的后腿直立起来，把狼驮得很高，然后，狼就用它两条长长的前脚，攀住羊圈，把羊叼走。从此，人们用“狼狈为奸”来比喻互相勾结，共干坏事。
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