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definition 1: to weaken the foundations of.
example: The dike is being undermined by water.
definition 2: to gradually, secretly, or imperceptibly weaken and destroy.
example: Her mother-in-law undermined her relationship with her husband.
example: The rumors undermined the candidate’s credibility.
See full entry
Collocations: Words often used in combination with the transitive verb undermine (definition 2)
undermine + NOUN: ~ authority, ~ efforts, ~ confidence, ~ credibility, ~ morale, ~ support, ~ security, ~ stability, ~ legitimacy, ~ regime, ~ policies, ~ attempts, ~ values, ~ goals, ~ independence, ~ peace, ~ trust, ~ belief, ~ principals, ~ viability, ~ ability, ~ democracy, ~ government, ~ autonomy, ~ alliance, ~ sovereignty