攻守同盟 Defensive alliance
Explanation
原指国家之间为了共同防御或进攻而结成的联盟。现在多指坏人之间为了掩盖罪恶或达到某种目的而相互勾结串通。
Originally referred to alliances between states for joint defense or offense. Now mostly refers to the collusion and conspiracy between criminals to cover up crimes or achieve certain goals.
Origin Story
战国时期，两个弱小的国家长期受到强邻的欺压，为了自保，他们决定缔结攻守同盟。他们约定，一旦其中一个国家遭到攻击，另一个国家必须出兵援助。多年来，这两个国家相安无事，共同抵御外敌的入侵。然而，随着时间的推移，其中一个国家的实力逐渐壮大，它开始觊觎同盟国的土地和资源，最终撕毁了攻守同盟，发动了战争。这个故事告诉我们，攻守同盟虽然可以暂时维护利益，但如果不建立在相互信任和共同的价值观之上，最终难免会走向破裂。
During the Warring States period, two weak states were long oppressed by powerful neighbors. To protect themselves, they decided to form a defensive alliance. They agreed that if one state was attacked, the other must send troops to aid. For many years, these two states lived peacefully, resisting the invasion of foreign enemies together. However, as time went on, one state gradually grew stronger and began to covet the land and resources of its ally, ultimately tearing up the defensive alliance and launching a war. This story tells us that although a defensive alliance can temporarily maintain interests, if it is not based on mutual trust and shared values, it will inevitably lead to a breakdown.
Usage
通常作宾语，指彼此勾结串通；有时也作定语。
Usually used as an object to refer to mutual collusion and conspiracy; sometimes also as an attributive.
Examples
-
这两个公司为了垄断市场，私下达成了攻守同盟。
zhe liang ge gongsi wei le longduan shichang, sixia dacheng le gongshou tongmeng.
These two companies secretly reached a defensive alliance to monopolize the market.
-
面对强敌，他们决定放下成见，形成攻守同盟，共同抵抗。
miandu qiangdi, tamen jueding fangxia chengjian, xingcheng gongshou tongmeng, gongtong dikang
In the face of a strong enemy, they decided to put aside their prejudices and form a defensive alliance to resist together.