People or animals that bark loudly; also, carnival or circus workers who shout to attract crowds to performances.
From Old English 'beorcan' (to bark) plus the agent suffix '-er.' Originally described dogs making noise, but by the 1800s extended to humans who loudly advertise shows or products.
The carnival 'barker' became an iconic American figure, using rhythm and persuasion to turn passersby into paying customers—they essentially invented modern advertising through sheer vocal charisma. Some barkers became so famous their names became synonymous with specific circuses or sideshows.
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