v. 削弱；损害；损伤

As reported in The New York Times in January 2017, people may lie awake in bed for hours, worrying about insomnia. Ironically, this very anxiety impairs their ability to fall asleep.【2017-1《纽约时报》】

他们可能会在床上辗转反侧数小时，为失眠而忧心忡忡。而具有讽刺意味的是，正是这种焦虑影响了他们入睡的能力。