[turn] a deaf ear

to pretend as if one cannot hear someone complaining or asking one something

The origin of the idiom "turn a deaf ear" lies in the concept of intentionally ignoring or disregarding what is being said. This phrase draws upon the physical condition of deafness, where individuals are unable to hear or comprehend sound. It can be used in personal relationships, professional settings, or even in broader societal discussions.

Despite their pleas for help, the authorities turned a deaf ear to the villagers' concerns about the dam.
She tried to talk to him about their relationship problems, but he just turned a deaf ear.
The teacher turned a deaf ear to the student's excuses for not completing the assignment.
Even though they provided evidence of wrongdoing, the company's management turned a deaf ear to their employees' complaints.
Parents should never turn a deaf ear when their children try to discuss important issues with them.