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TOEFL IELTS BNC: 3409 COCA: 3697
undermineverb [ T ]uk/ˌʌn.dəˈmaɪn/ us/ˌʌn.dɚˈmaɪn/

C2 to make someone less confident, less powerful, or less likely to succeed, or to make something weaker, often gradually（常指逐渐地）削弱信心、权威等，损害

The president has accused two cabinet members of working secretly to undermine his position/him.总统指责有两位内阁部长在暗中算计他。
Criticism just undermines their confidence.批评只是削弱了他们的信心。

More examples

A succession of scandals and revelations has undermined the government over the past year.

Suddenly she just turned on me and accused me of undermining her.

The country's economic position has been seriously undermined by this affair.

He's been trying to undermine her position by spreading rumours about her.

If you continually criticize children you can seriously undermine their confidence.

TOEFL IELTS BNC: 3409 COCA: 3697
undermine

verb

ADVERB | VERB + UNDERMINE ADVERB➤greatly, radically, seriously, severely, significantly極大地破壞；徹底損害；嚴重削弱；顯著破壞◇His position within the government has been seriously undermined.他在政府中的地位遭到嚴重削弱。➤completely, totally完全／徹底破壞➤ultimately最終破壞◇It ultimately undermined his ability to play.這最終削弱了他的比賽能力。➤rather, somewhat有些損壞；一定程度上削弱▸➤further進一步破壞▸➤effectively有效削弱➤actively主動破壞▸➤fatally致命地破壞▸➤subtly不知不覺地損壞➤systematically系統地破壞▸➤gradually, increasingly, progressively逐漸／日益／逐步削弱▸➤eventually最終破壞➤potentially可能會破壞▸➤constantly不斷破壞VERB + UNDERMINE➤threaten to威脅要破壞▸➤attempt to, seek to, try to企圖破壞；設法損害▸➤conspire to, help (to), serve to, tend to密謀破壞；助長破壞；有削弱作用；趨向於損害▸➤be likely to很可能破壞▸➤be designed to, be intended to計劃破壞；企圖損害◇a terror attack intended to undermine the morale of citizens旨在打擊市民士氣的一次恐怖襲擊
TOEFL IELTS BNC: 3409 COCA: 3697
undermine

verb

undermine ♦︎ erode ♦︎ weaken ♦︎ sap ♦︎ wear sb/sth downThese words all mean to gradually make sth weaker. 这些词均表示逐渐削弱。PATTERNS AND COLLOCATIONS 句型和搭配◆to undermine / erode / weaken / sap sb's confidence / morale◆to undermine / erode / weaken sb's position◆to weaken / wear down sb's resistance■ undermine [transitive] to make sth, especially sb's confidence or authority, gradually weaker or less effective 逐渐削弱（信心、权威等）；使逐步减少效力◆The director saw this move as an attempt to undermine his authority.经理认为此举是想削弱他的权威。◆This crisis threatens to undermine the very foundations of social life.这场危机可能会损害社会生活的根基。ⓘ Things that can be undermined include sb's authority, credibility, faith, belief, confidence or morale or the foundations, security or stability of sth. * undermine的宾语可以是某人的authority、credibility、faith、belief、confidence或morale，或是某事物的foundation、security或stability。■ erode ɪˈrəʊd; NAmE ɪˈroʊd [transitive, intransitive] (rather formal, especially business 尤用于商业) to gradually destroy the value of sth or people's confidence in sth 逐渐损害（价值或信心）；毁坏；削弱◆Price rises have eroded profit margins.价格上涨使利润减少了。◆We live in a world whose moral base has been eroded.我们生活在一个道德基础已变得薄弱的世界。ⓘ Things that can be eroded include profits, profitability, margins, revenues, the value of sth, sb's confidence or support. * erode的宾语可以是profit、profitability、margin、revenue、the value of sth、sb's confidence或support。■ weaken [intransitive, transitive] to become or make sb less determined or certain about sth; to make sb's position of authority weaker 使（决心或确信度）减弱；动摇；削弱◆She felt herself beginning to weaken in the face of his persuasion.面对他的劝说，她觉得自己开始犹豫了。◆Nothing could weaken his resolve to continue.什么也不能动摇他继续下去的决心。◆This new scandal has severely weakened the President's position.这桩新丑闻已严重动摇了总统的地位。■ sap (-pp-) [transitive] to make sb/ sth less strong; to gradually destroy sb's energy, confidence or enthusiasm 使虚弱；削弱（体力、信心或热情）◆The hot sun sapped our energy.火辣辣的太阳烤得我们虚弱无力。◆Years of failure have sapped him of his confidence.连年失败使他逐渐丧失了自信。ⓘ Things that can be sapped include sb's strength, energy, vitality, enthusiasm, will, confidence and morale. * sap的宾语可以是某人的strength、energy、vitality、enthusiasm、will、confidence和morale。■ ˌwear sb/sth ˈdown

phrasal verb

(wore, worn)to make sb/sth weaker or less determined, especially by continually attacking or putting pressure on them/it over a period of time （尤指通过不断攻击或施加压力）使衰弱，使意志薄弱◆Her persistence paid off and she eventually wore me down.她锲而不舍取得成功，终于使我服输了。◆This relentless pressure began to wear down their resistance.这种无情的压力开始瓦解他们的抵抗。
TOEFL IELTS BNC: 3409 COCA: 3697
undermine
To become, or to make something weaker: lessen, reduce, subside...
To harm someone's reputation: discredit, slander, taint...
To dig: dig out, dig up, dig...

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