Idiom Definition:
"to turn a blind eye (on/to something)"
to make a conscious effort to not see something, usually something one would rather not see because it would require an effort, which one does not wish to make, to look after the situation
Synonyms:
avoid, blink, cold-shoulder, discount, disdain, evade, forget, ignore, neglect, overlook, overpass, pooh-pooh, reject, scorn, slight