Английский словарь американских идиом - open one's eyes

or open up one's eyes {v. phr.} To make a person see or understand the truth; make a person realize; tell a person what is really happening or what really exists. * /Mary didn't believe that her cousin could be mean until the cousin opened Mary's eyes by scratching and biting her./ * /John's eyes were opened up to the world of nature when he visited his grandfather's farm./ Compare: EYES OPEN, WISE UP. - eye opener {n.} Something that makes you understand the truth. * /Pam's first visit to school was a real eye-opener./