Be disconcerted by what one hears, especially when one is being talked about. For example, Were your ears burning? Jim was telling us about your exploits. Similarly, make one's ears burn means “to embarrass,” as in Mom's stories about us as babies make my ears burn. These expressions allude to one's ears turning red from blushing.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.