see through

Short definition from Wiktionary

Verb

1. 1
   To perceive visually through something transparent.
2. 2
   To not be deceived by something that is false or misleading; to understand the hidden truth about someone or something.
3. 3
   To recognize someone's true motives or character.
4. 4
   To provide support or cooperation to (a person) throughout a period of time; to support someone through a difficult time.
5. 5
   To do something until it is finished; to continue working on (something) until it is finished.
6. 6
   To constitute ample supply for one for.

Adjective

1. 1
   Transparent or translucent; that can be seen through.