undermine

[uhn-der-mahyn or, especially for 1, 2, 4, uhn-der-mahyn] Origin

un·der·mine

[uhn-der-mahyn or, especially for 1, 2, 4, uhn-der-mahyn]
verb (used with object), un·der·mined, un·der·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.

Origin:
1300–50; Middle English underminen. See under-, mine2

un·der·min·er, noun
un·der·min·ing·ly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Undermine is an LSAT word you need to know.
So is placebo. Does it mean:
a substance having no pharmacological effect but given merely to satisfy a patient who supposes it to be a medicine
occurring or coming later or after; following in order or succession
Collins
World English Dictionary
undermine (ˌʌndəˈmaɪn)
 
vb
1.  (of the sea, wind, etc) to wear away the bottom or base of (land, cliffs, etc)
2.  to weaken gradually or insidiously: their insults undermined her confidence
3.  to tunnel or dig beneath
 
under'miner
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

undermine
c.1300, undermyne, from under + mine (v.). The fig. sense is attested from c.1430. Cf. Du. ondermijnen, Dan. underminere, Ger. unterminiren.
Online Etymology Dictionary, © 2010 Douglas Harper
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