From Longman Dictionary of Contemporary Englishtune out phrasal verb informalIGNOREto ignore or stop listening to someone or something A bored child may simply tune out.tune somebody/something ↔ out I learned to tune out the background noise. → tune→ See Verb table
Examples from the Corpus
tune out• There was a warning voice in the back of her mind, but she tuned it out.• He had learned to tune out the kids' constant questions. 