verb
1.
Synonyms: weaken 1, attenuate, blunt, cripple, debilitate, disable, enfeeble, sap, unbrace, unstrengthen
Related Word: ruin, wreck; foil, frustrate, thwart
Idioms: bore from within
Antonyms: reinforce
2.
Synonyms: sabotage , subvert, wreck
UNDERMINE
Meaning of UNDERMINE in English
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003