This is the 6391st most frequent Chinese word.
披
"披" means "to drape over, spread, or wear on the shoulders."
In this sentence, '披' is used to indicate the action of wearing or draping clothing over oneself.
他披上了一件厚厚的外套。
He put on a thick overcoat.
Here, '披' is metaphorically describing sunlight being spread over the mountain top.
阳光披在山顶上,显得格外美丽。
Sunlight drapes over the mountain top, making it exceptionally beautiful.
In this example, '披' denotes the way her hair is let down or hanging loosely.