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WordReference Random House Learner's Dictionary of American English © 2024un•der•mine /ˌʌndɚˈmaɪn/USA pronunciation v. [~ + object], -mined, -min•ing. - to weaken or destroy by degrees:Her health was undermined by the stress of her job.
- to attack by indirect, secret, or hidden means:looking for ways to undermine her authority.
- to weaken or cause to collapse by removing underlying supports.
WordReference Random House Unabridged Dictionary of American English © 2024un•der•mine (un′dər mīn′ or, esp. for 1, 2, 4, un′dər mīn′),USA pronunciation v.t., -mined, -min•ing. - to injure or destroy by insidious activity or imperceptible stages, sometimes tending toward a sudden dramatic effect.
- to attack by indirect, secret, or underhand means;
attempt to subvert by stealth. - to make an excavation under;
dig or tunnel beneath, as a military stronghold. - to weaken or cause to collapse by removing underlying support, as by digging away or eroding the foundation.
- Middle English underminen. See under-, mine2 1300–50
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