密切合作：指两个或多个人或组织之间紧密合作，互相支持和配合。
狼狈为奸：指两个或多个人合谋，进行不正当、不道德的活动。
in close cooperation
同义词： hand in glove / cooperatively
They are made for one another, like the hand and glove.
他们真是一对，就像手和手套一样。
Look here, you and I, we're made for one another…hand and glove.
喂，你看，你和我，我们真是天生一对……好象手和手套一样。
Several journalists were found to be hand and glove with enemy agents.
有几位新闻记者被查出与敌特勾结。
The man pulled on his glove and again beat his hand against his leg.
VOA : special.2010.05.01
With the American President, we talked about the future of the G20, and I said to him in very clear terms that we wish to work hand in glove, France and the United States, on these issues.
In China, too, the state draws up long-term plans, funnels cash to industries it deems strategic and works hand-in-glove with national champions, like Huawei and Haier (see article).
Because of this overwhelming mineral wealth and the desire of the MNCs to tap it, the government, very often, are in hand in glove with these MNCs, and rode roughshod over all democratic norms and principles of political equality and equity to acquire the land.