weaken
单词辨析：
尤指使信心、权威等变弱或失去效力。
These limitations may undermine the health care system.
这些限制可能会损害医疗保健制度。
The supporters' confidence in the government has been undermined by several recent scandals.
最近几次丑闻已动摇了支持者对政府的信心。
The constant criticism has undermined her position.
不断的批评已经损害了他的地位。
尤指逐渐削弱某人的力量、信心、意志等。
The hot sun sapped the energy of the marathon runners.
火辣辣的太阳烤得那些马拉松选手虚软无力。
Years of failures in the elections have sapped him of his confidence.
连年竞选失败使他逐渐丧失了自信。
指使某人或某物变得不重要或不强大，或使人身体衰弱，也可指动摇某人的决心。
He did it to weaken the manager's position.
他这么做是为了削弱经理的地位。
The new evidence has weakened the case against the accused.
新的证据削弱了对被告的指控力度。
The children were weakened by lack of essential nutrients for a long time.
那些孩子因为长期营养不良而身体衰弱。
These policies have weakened the resolve of potential house buyers.
这些政策动摇了潜在购房者的决心。
相关例句：
And despite the costs involved, America's commitment will not weaken.
尽管付出了代价，美国的承诺不会变弱。
Jennie weakened, and finally relented
詹妮的态度有所缓和，最终软了下来。
And we weaken our position permanently, you know that.
你知道这会永久性的削弱我们的地位。
The Bundesbank's seemingly impregnable position has begun to weaken.
德意志联邦银行看似不可撼动的地位开始削弱了。
The legitimacy of the market will weaken.
市场的正当性将被削弱。
The verdict hasn't weakened his resolve to fight the charges against him.
判决没有动摇他洗清对自己的指控的决心。