erosion的基本意思是指某物受酸、雨、风等“腐蚀,侵蚀,磨损”,用作比喻可指“威信日渐扫地”“势力日渐削弱”。

Soil conservation is intended to curb erosion.土壤保持旨在控制水土流失。
The president was facing a very significant erosion of public support.总统面临着公众对他的支持大幅度下降的局面。

［同义词］   declination, decrease, rust
［反义词］   increase, rise
［词源］＜拉丁语erosio(腐蚀)