1. The soldiers undermined the wall. ��ʿ����ǽ�����ڵص���
2. Or at least undermine the efforts doctors, nurses and even complete strangers make on their behalf. �������������ƻ�ҽ������ʿ������ֻ��Ϊ���������İ���˵�Ŭ����
3. Any country or Government which wants to proceed towards tyranny starts to undermine legal rights and undermine the law. �κ�һ�����һ�����Ҫ����ר�ƣ����Ǵ��ƻ��Ϸ�Ȩ���ͷ��ɿ�ʼ�ġ�
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v.
1. destroy property or hinder normal operations
2. hollow out as if making a cave or opening