- attacked, weakened, or defeated by underhand or seemingly harmless actions or by imperceptible stages:Both the struggling students and the most gifted ones are receiving limited support from an undermined educational system.
- weakened or made to collapse by removing underlying support, as by eroding or digging away the foundation:With the release of material from the undermined cliffs at these sites, we should have had far more sand to feed the beaches, not less.
- deliberately weakened by an excavation or tunnel dug underneath, as by an enemy in war:When the town was besieged, its defenders abandoned the undermined walls and retired into the citadel.
- the simple past tense and past participle of undermine.
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