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hearing-ear dog

American  
[heer-ing-eer dawg] / ˈhɪər ɪŋˈɪər ˌdɔg /

noun

  1. a dog that has been trained to alert a person who is hard of hearing to important sounds, as a telephone ringing or dangerous noises.

Etymology

Origin of hearing-ear dog

First recorded in 1975–80; on the model of Seeing Eye dog

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.