/ ˈbɑːkə(r); NAmE ˈbɑːrk-/ noun
a person who stands outside a place where there is entertainment and shouts to people to go in
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WORD ORIGIN
late Middle English : from bark a sound made by dogs and some other animals + -er . The original sense was a person or animal that barks; a noisy protestor , hence the current sense (late 17th cent.).