To resort to dishonest tricks; to collude in wrongdoing; to manipulate covertly.
在这次招标过程中，有人怀疑几家公司高下其手，私下串通以获取不正当利益。
During this bidding process, some suspected that several companies had colluded secretly to gain undue advantages.
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To resort to dishonest tricks; to collude in wrongdoing; to manipulate covertly.