Dictionary / Vocabulary / 耳にタコができる
みみにたこができる
to be told or made to hear something so often that you (metaphorically) get calluses on your ears
Also written 耳にたこができる、耳に胼胝ができる
お祖母さんの昔話は耳にたこができるほど聞かされた。
I've heard my grandma's stories so often that I'm heartily sick of them.