look through

Short definition from Wiktionary

Verb

1. 1
   Used other than figuratively or idiomatically: see look, through.
2. 2
   To take a view of the contents of; search in, either with the eyes or by hand.
3. 3
   To penetrate with the understanding; to see through.
4. 4
   To appear or pretend not to see something or someone who is clearly visible.