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Meaning of undermine

un•der•mine

Pronunciation: (un"dur-mīn' or, esp. for 1, 2, 4, un'dur-mīn"), [key]
— -mined, -min•ing.
  1. to injure or destroy by insidious activity or imperceptible stages, sometimes tending toward a sudden dramatic effect.
  2. to attack by indirect, secret, or underhand means; attempt to subvert by stealth.
  3. to make an excavation under; dig or tunnel beneath, as a military stronghold.
  4. to weaken or cause to collapse by removing underlying support, as by digging away or eroding the foundation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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