verb

undermine

to undermine, to weaken, to subvert

His constant criticism undermined her confidence.

His constant criticism undermined her confidence.

They tried to undermine the government.

They tried to undermine the government.

to undermine ((sth.)) to weaken (sth.) gradually The scandal could undermine his authority.

Synonyms: weaken, sabotage, subvert; Antonyms: strengthen, support, reinforce

From 'under' + 'mine'. Literally, to dig a mine under something (like a castle wall) to make it collapse.

Picture miners digging a tunnel *under* a fortress to make it fall. This is what you do to someone's authority or confidence.

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