及物动词
1. （常指逐渐或反复）削弱，损害（情感、体制等）
If you undermine something such as a feeling or a system, you make it less strong or less secure than it was before, often by a gradual process or by repeated efforts.
2. （常指间接地）削弱，损害，动摇（某人的地位或权威）
If you undermine someone or undermine their position or authority, you make their authority or position less secure, often by indirect methods.
3. 破坏，损害（某人的努力或成功的机会）
If you undermine someone's efforts or undermine their chances of achieving something, you behave in a way that makes them less likely to succeed.
1. hollow out as if making a cave or opening
e.g. The river was caving the banks
Synonym: cave
2. destroy property or hinder normal operations
e.g. The Resistance sabotaged railroad operations during the war