Definition: to realise what someone’s intentions are, even though they are trying to hide them.
(This phrasal verb has more than one meaning)
E.g.1: Most people can see through the commercialisation of Easter and appreciate its real meaning.
E.g.2: He was being unusually nice to her, but she could see through him and realised it was because he wanted her to help him.
This phrasal verb cannot be separated.