undermine /,Anda'main; zAnd'main/ vt [VP6A] 1 make a hollow or tunnel under; weaken at the base: 在…之下掘洞或地道; 使從基礎(chǔ)損壞： cliffs ~d by the sea. 被海浪沖壞底部的懸崖。 2 weaken gradually: 逐漸削弱或損壞： His health was ~d by drink. 他的健康由于飲酒而逐漸損壞。 The President's enemies are spreading rumours to ~ his authority. 總統(tǒng)的敵人在散偽訛言，以逐潮破壞他的成信。