v. t. | 1. | To excavate the earth beneath, or the part of, especially for the purpose of causing to fall or be overthrown; to form a mine under; to sap; |
2. | Fig.: To remove the foundation or support of by clandestine means; to ruin in an underhand way; |
Verb | 1. | undermine - destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" |
2. | undermine - hollow out as if making a cave or opening; "The river was caving the banks" Synonyms: cave |