声气相通

Explanation: Collude with each other, exchange information. 　　Source: Ming Feng Meng "Jingshitongyan" Volume name of this friend has a few color End Results were compared, that the confidant; hinterland to shine on those, that the intimate; complain Xiangqiu persons, that the knowledge and appreciation. " Thesaurus:  in the same camp, click, cut from the same cloth, congeniality, information agree with each othor, Birds of the same feather flock together, Shengyingqiqiu