to cut or remove the stitches from a line of sewing

If you unpick a difficult subject, you separate and examine its different parts carefully.

He expertly unpicks the significant features of each painting. 他专业地深入剖析每一幅画的重要特征。

If I try to unpick my own motivation, I think mostly I was jealous. 如果要我深入剖析我自己的动机，我想在极大程度上是嫉妒。

to gradually destroy or remove the good effects of what someone has done or created

The former leader now has to watch his successor unpicking what he strived so hard to achieve. 这位前任领导现在不得不眼睁睁地看着他的继任者一点点地毁掉他辛苦开创的局面。