unholy alliance

uncountable

A coalition among seemingly antagonistic groups, especially if one is religious, for ad hoc or hidden gain. (See examples.)

Japanese Meaning

一見敵対するグループ、特にその中に宗教的要素を含むグループが、一時的または隠された利益を目的に結んだ同盟

Several corporate executives struck an unholy alliance with fringe religious leaders to secure favorable regulations behind closed doors.

数人の企業幹部が有利な規制を得るため、過激な宗教指導者たちと裏で不義な同盟を結んだ。

Sense（1）

A coalition among seemingly antagonistic groups, especially if one is religious, for ad hoc or hidden gain. (See examples.)