(one's) ears are red
One is blushing from deep embarrassment. His ears were red and he stared at the ground as his teacher read his poem out loud to the entire class. Oh my, have I said something amiss? Your ears are red!
one's ears are red
Fig. [for someone's ears] to be red from embarrassment. I'm so embarrassed. Wow, are my ears red! My ears are red! I can't believe I said that.