Something that is worn out can no longer be used because it is so old or because it has been damaged by continued use.

My jeans are almost worn out because I've worn them so much. 因为穿太多次，我的牛仔裤几乎要破了。

[ before noun ] worn-out clothes/carpet/equipment 破旧的衣物／地毯／设备

extremely tired

I've been working all night and I'm worn out. 我整晚都在工作，已经筋疲力尽了。