Let's talk about idiomatic expressions!
"Turn a blind eye to something" means pretending not so see something because it is not convenient or for any other reason. Feel free to explain it in your own words!
Some people say that the idiomatic expression ‘turn a blind eye’ to something comes from the Battle of Copenhagen of 1801, when Horatio Nelson deliberately avoided seeing his commander’s signal to withdraw by putting his blind eye to the telescope. His fleet was victorious.