UNDERMINES是什么意思

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.

If you undermine someone or undermine their position or authority, you make their authority or position less secure, often by indirect methods.

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.