关门打狗 Close the door and beat the dog
Explanation
比喻将敌人或对手控制在自己的势力范围内，然后进行有效打击。也比喻不给对方任何逃跑的机会，彻底消灭对方。
It is a metaphor for controlling the enemy or opponent within one's own sphere of influence, and then launching an effective attack. It also means to give the other party no chance to escape, and completely eliminate them.
Origin Story
战国时期，魏国军队与赵国军队交战，魏军占据有利地形，将赵军包围在狭小的山谷中。魏国将军下令：“关门打狗！给我狠狠地打！”魏军士兵士气高涨，对赵军展开猛烈攻击，赵军溃不成军，最终被全歼。这场战斗，魏军以少胜多，这得益于他们巧妙地利用地形，采取了关门打狗的战术，将敌人控制在自己的包围圈内，然后予以歼灭。从此，“关门打狗”这句成语，就用来比喻将敌人或对手控制在自己势力范围内，然后进行有效打击，不给对方任何逃跑的机会，彻底消灭对方。
During the Warring States period, the Wei and Zhao armies clashed. The Wei army occupied advantageous terrain, encircling the Zhao army in a narrow valley. The Wei general commanded, "Close the gates and beat the dogs! Attack them fiercely!" The Wei soldiers, high in morale, launched a fierce attack on the Zhao army, which was routed and eventually annihilated. In this battle, the smaller Wei army won a decisive victory. This was due to their clever use of terrain and the adoption of the strategy known as "closing the door to beat the dog," which involved controlling the enemy within their own encirclement before destroying them completely. From that point onwards, the idiom "closing the door to beat the dog" has been used to describe the effective control and elimination of an opponent.
Usage
多用于军事、商业等竞争场合，形容采取的策略。
Mostly used in military and commercial competition situations to describe the strategy adopted.
Examples
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他们采用关门打狗的战术，迅速全歼了敌人。
tamen caiyong guanmen dagou de zhanshu, xunsu quanjianle diren
They used the tactic of closing the door and beating the dog, quickly annihilating the enemy.
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公司内部竞争激烈，有人采取关门打狗的策略，打压竞争对手。
gongsi neibu jingzheng jilie, youren caiqu guanmen dagou de celue, dayajingzheng duishou
Competition within the company is fierce, and some people adopt the strategy of closing the door and beating the dog to suppress competitors.