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TOEFL IELTS BNC: 3409 COCA: 3697
undermine

verb

undermine ♦︎ erode ♦︎ weaken ♦︎ sap ♦︎ wear sb/sth downThese words all mean to gradually make sth weaker. 這些詞均表示逐漸削弱。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 逐漸削弱（信心、權威等）；使逐步減少效力◆The director saw this move as an attempt to undermine his authority.經理認爲此舉是想削弱他的權威。◆This crisis threatens to undermine the very foundations of social life.這場危機可能會損害社會生活的根基。ⓘ Things that can be undermined include sb's authority, credibility, faith, belief, confidence or morale or the foundations, security or stability of sth. * undermine的賓語可以是某人的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 尤用於商業) to gradually destroy the value of sth or people's confidence in sth 逐漸損害（價值或信心）；毀壞；削弱◆Price rises have eroded profit margins.價格上漲使利潤減少了。◆We live in a world whose moral base has been eroded.我們生活在一個道德基礎已變得薄弱的世界。ⓘ Things that can be eroded include profits, profitability, margins, revenues, the value of sth, sb's confidence or support. * erode的賓語可以是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（決心或確信度）減弱；動搖；削弱◆She felt herself beginning to weaken in the face of his persuasion.面對他的勸說，她覺得自己開始猶豫了。◆Nothing could weaken his resolve to continue.什麽也不能動搖他繼續下去的決心。◆This new scandal has severely weakened the President's position.這樁新醜聞已嚴重動搖了總統的地位。■ sap (-pp-) [transitive] to make sb/ sth less strong; to gradually destroy sb's energy, confidence or enthusiasm 使虛弱；削弱（體力、信心或熱情）◆The hot sun sapped our energy.火辣辣的太陽烤得我們虛弱無力。◆Years of failure have sapped him of his confidence.連年失敗使他逐漸喪失了自信。ⓘ Things that can be sapped include sb's strength, energy, vitality, enthusiasm, will, confidence and morale. * sap的賓語可以是某人的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 （尤指通過不斷攻擊或施加壓力）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，終於使我服輸了。◆This relentless pressure began to wear down their resistance.這種無情的壓力開始瓦解他們的抵抗。

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