Princeton's WordNet

1. sabotage, undermine, countermine, counteract, subvert, weaken(verb)

   destroy property or hinder normal operations

   "The Resistance sabotaged railroad operations during the war"

2. cave, undermine(verb)

   hollow out as if making a cave or opening

   "The river was caving the banks"

Kernerman English Learner's Dictionary

1. undermine(verb)ˌʌn dərˈmaɪn or, esp. for 1,2,4, ˈʌn dərˌmaɪn

   to do sth that makes sth or sb seem weaker, feel less confident, etc.

   evidence that undermines the case for closing small hospitals; rumors aimed at undermining the opposing candidate

Wiktionary

1. undermine(Verb)

   To dig underneath (something), to make a passage or for destructive or military purposes; to sap.

2. undermine(Verb)

   To weaken or work against; to hinder, sabotage.

   The war efforts were undermined by the constant bickering between the allies.

Webster Dictionary

1. Undermine(verb)

   to excavate the earth beneath, or the part of, especially for the purpose of causing to fall or be overthrown; to form a mine under; to sap; as, to undermine a wall

2. Undermine(verb)

   fig.: To remove the foundation or support of by clandestine means; to ruin in an underhand way; as, to undermine reputation; to undermine the constitution of the state

• ondergraweAfrikaans
• يُقَوِّض، يَهْدِمArabic
• подкопавамBulgarian
• minarPortuguese (BR)
• podkopat, podemlítCzech
• untergrabenGerman
• underminereDanish
• υποσκάπτω, καταστρέφω τα θεμέλιαGreek
• minarSpanish
• altõõnestamaEstonian
• سست کردنFarsi
• kaivaa maata jnk altaFinnish
• minerFrench
• לַחתוֹר תַחַתHebrew
• असुरक्षित बनानाHindi
• potkopatiCroatian
• aláaknázHungarian
• mengikisIndonesian
• grafa göng undir; grafa undanIcelandic
• minare, indebolireItalian
• 土台をくずすJapanese
• 토대를 허물다Korean
• paplautiLithuanian
• parakties apakšā; izskalotLatvian
• menghakisMalay
• ondermijnenDutch
• undergrave, underminereNorwegian
• podkopaćPolish
• سست کردنPersian
• لاندنۍ برخه ژورول، په پټه دچا بدنامول، په پټه زيان رسول، كمزوري كول، بې سيكه كولPashto
• minarPortuguese
• a minaRomanian
• подмыватьRussian
• podkopať, podmyťSlovak
• spodkopatiSlovenian
• potkopatiSerbian
• undermineraSwedish
• ทำให้กร่อนThai
• altını kazmak/oymakTurkish
• 削弱(侵蝕)…基礎Chinese (Trad.)
• підривати, руйнуватиUkrainian
• غير محفوظ بناناUrdu
• đào dưới chânVietnamese
• 削弱（侵蚀）...的基础Chinese (Simp.)