look through somebody/something phrasal verb ( see also ↑ look )
1 . to look for something among a pile of papers, in a drawer, in someone’s pockets etc SYN go through :
I’ve looked through all my papers but I still can’t find the contract.
2 . to not notice or pretend to not notice someone you know, even though you see them
look straight/right through somebody
I saw Fiona in the street yesterday and she looked straight through me.