以邻为壑 to use one's neighbor as a sink
Explanation
比喻把自己的困难或祸害转嫁给别人，只顾自己一方的利益。
It means transferring one's own difficulties or harm to others, only taking care of one's own interests.
Origin Story
战国时期，魏国有个叫公孙鞅的人，他为了巩固自己的权力，不顾百姓死活，强令修建大型水利工程。工程完成后，他将多余的水排向邻国，导致邻国发生水灾。百姓怨声载道，公孙鞅却毫不在乎，他认为只要魏国安然无恙，牺牲邻国也在所不惜。这便是“以邻为壑”的典故。
During the Warring States period, there was a man in Wei named Gongsun Yang. To consolidate his power, he ordered the construction of a large water conservancy project regardless of people's lives. After the project was completed, he diverted the excess water to neighboring countries, causing floods in the neighboring countries. The people complained, but Gongsun Yang didn't care. He thought that as long as Wei was safe, it didn't matter if neighboring countries suffered. This is the origin of the idiom "Yǐ lín wéi hè".
Usage
用于比喻只顾自己一方的利益，把困难或祸害转嫁给别人。
It is used to illustrate that one only considers one's own interests and transfers difficulties or harm to others.
Examples
-
他们为了自身利益，不惜以邻为壑，损害他人利益。
tamen wei le zishen liyi,buxishu yilinweihè,sunhai taren liyi
They sacrificed the interests of others for their own benefit.
-
这个国家为了发展经济，竟然以邻为壑，将污染排放到邻国。
zhege guojia wei le fazhan jingji,jingran yilinweihè,jiang wuran paifang dao lingguo
In order to develop its economy, the country even polluted its neighboring country, which is immoral.