Definitions from Wiktionary (undermine)

▸ verb:  To dig underneath (something), to make a passage for destructive or military purposes; to sap.
▸ verb:  (figuratively) To weaken or work against; to hinder, sabotage.
▸ verb:  To erode the base or foundation of something, e.g. by the action of water.
▸ verb:  (philosophy) To regard an object as the sum of the parts that compose it, in object-oriented ontology.
▸ Also see undermine

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