turn a blind eye

/tˈɜːn ɐ blˈaɪnd ˈaɪ/

to turn a blind eye

to pretend as if one cannot see or notice something

Examples

1. I knew he would only give himself a cat's lick, but distracted by what was going on downstairs, I decided to turn a blind eye.

2. I can't turn a blind eye when someone is being robbed.

3. Teachers were turning a blind eye to smoking in school.

4. Management often turn a blind eye to bullying in the workplace.