Etymology
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barker (n.)

late 14c., "a dog;" late 15c., "noisy fellow;" agent noun from bark (v.). Specific sense of "loud assistant in an auction, store, or show" is from 1690s.

updated on March 31, 2017

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Definitions of barker from WordNet

barker (n.)
someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers;
barker (n.)
informal terms for dogs;
Synonyms: pooch / doggie / doggy / bow-wow
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.