Definition of undermine in English:

undermine

Syllabification: un·der·mine
Pronunciation: /ˌəndərˈmīn/

verb

[with object]
1Erode the base or foundation of (a rock formation).
More example sentences
  • The lighthouse stands on a plinth of rock undermined by caves, perhaps once used by smugglers.
Synonyms
erode, wear away, eat away at
1.1Dig or excavate beneath (a building or fortification) so as to make it collapse.
More example sentences
  • Within days, the French advanced into the city outskirts and undermined numerous buildings.
  • The Romans also developed tunnelling for military purposes, either by breaking through behind enemy defences or by undermining fortifications to cause their collapse.
  • The disaster was caused by the total collapse of his house in the Rue d' Anjou, undermined by the excavations carried out by the bank next door for its strong room.
2Damage or weaken (someone or something), especially gradually or insidiously: this could undermine years of hard work
More example sentences
  • What they don't understand is that being boring limits their power and undermines their effectiveness.
  • And yet, the way he handled the events that followed gradually undermined his position.
  • They might have to share power and that is dangerous because it would undermine their position of power.
Synonyms
subvert, undercut, sabotage, threaten, weaken, compromise, diminish, reduce, impair, mar, spoil, ruin, damage, hurt, injure, cripple, sap, shake
informal drag through the mud

Origin

Middle English: from under- + the verb mine2, probably suggested by Middle Dutch ondermineren.

Derivatives

underminer

noun
More example sentences
  • That would be on account of my false self, my twin, my judge, unhappy anima and underminer.
  • Once again, these underminers of our foreign policy are doing more harm to our country.
  • So you see yourself as an underminer of the system?

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict