to take the stitches (= pieces of thread that have been sewn to hold something together) out of something

They unstitched the sleeves from the arm-holes of a jacket to make it look tattered and torn. 他们拆掉上衣袖孔的缝线取下袖子，让上衣看起来破破烂烂。

to change, spoil, or destroy something that has existed or been done previously

In two years she has unstitched almost every aspect of the business and re-fashioned it. 在两年的时间里，她几乎改变了企业的各个方面，并重塑形象。

He was an astute politician whose career came unstitched when - after years of waiting in the wings - he reached the highest office. 他是一位精明的政治家，经过多年的等待，当他达到最高职位时，事业焕然一新。