出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第172页（238字）
指在明里和暗中与人来往，例他们明来暗往互相勾结，企图贪污公款，终因事情败露而未能得逞。
They had been in close contact with each other and had colluded in trying to lay hands on public funds．Their plot failed when they were exposed．