1. (verb) sabotage, undermine, countermine, counteract, subvert, weaken
destroy property or hinder normal operations
Synonyms: countermine, countervail, bring down, vitiate, counterbalance, deprave, debauch, cave, soften, misdirect, overturn, demoralize, counteract, subvert, sabotage, debase, profane, weaken, corrupt, damp, pervert, neutralize, demoralise, countercheck, antagonise, de-escalate, undermine, step down, dampen, overthrow, antagonize, break
2. (verb) cave, undermine
hollow out as if making a cave or opening
Synonyms: subvert, undermine, cave, spelunk, countermine, sabotage, weaken, counteract
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Synonyms and Antonyms of undermine 
