Pronunciation: /ʌndəˈmʌɪn/
verb
[with object]-
1erode the base or foundation of (a rock formation): the flow of water had undermined pillars supporting the roof
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dig or excavate beneath (a building or fortification) so as to make it collapse: the demolition engineers did eventually undermine two of the tower’s six sides
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2lessen the effectiveness, power, or ability of, especially gradually or insidiously: this could undermine years of hard work
