play tricks;be up to some mischief ;

Those men are behaving very suspiciously . They're engaged in some fishy business . I'll be bound.
那些人行为非常可疑,我敢肯定他们在搞鬼.
来源:互联网摘选The teacher suspected that there had been some monkey business going on in the class.
老师怀疑班上一直有人在搞鬼.
来源:网络文摘精选
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