The phrase "turned a blind eye" means to ignore or deliberately overlook something. There are several synonyms for this phrase that can be used interchangeably depending on the context of the situation. Some of the common synonyms include: ignored, disregarded, overlooked, disregarded, neglected, pretended not to see, failed to notice, looked the other way, turned away, paid no attention, and pretended not to know. All of these phrases convey the same meaning of deliberately ignoring something that should have been addressed or noticed. It's important to choose the appropriate synonym depending on the context and level of severity of the situation.