turn a deaf ear
Refuse to listen, as in You can plead all day but he's turning a deaf ear to everyone. This expression dates from the first half of the 1400s and was in most proverb collections from 1546 on. Also see fall on deaf ears.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.