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1. to weaken or damage something, especially gradually or insidiously
2. to lessen the effectiveness, power, or ability of, especially gradually or insidiously
1. Lex Luthor's constant schemes are intended to undermine Superman's trustworthiness in the eyes of the public.
2. The villain's plot was to undermine the city's infrastructure, causing chaos without a direct attack.
3. During the courtroom scene in 'A Few Good Men', Lieutenant Kaffee tries to undermine Colonel Jessup’s credibility by questioning his orders.
4. In an episode of 'Doraemon', Gian tried to undermine Nobita's confidence before the singing competition by making fun of his voice.