undermine /ˌʌndəˈmain/ vt. 1.暗中破坏，逐渐削弱：Drink is undermining his health. 饮酒使他的身体垮下去。She jealously tried to undermine our friendship. 她出于妒忌竭力破坏我们的友谊。2.侵蚀…的基础：The cliff was undermined by the waves. 大浪冲坏了悬崖的基部。