turnstile
noun
turn·stile ˈtərn-ˌstī(-ə)l 
: a post with arms pivoted on the top set in a passageway so that persons can pass through only on foot one by one
Example Sentences
Recent Examples on the Web The teen reportedly jumped an East Harlem subway turnstile on Saturday, then began mouthing off to the cops who approached him. 
The Editorial Board, WSJ, 28 July 2022 Three days later, the teen and a 16-year-old girl tried to jump a turnstile at the 125th Street station near Lexington Ave. Rebecca Rosenberg, Fox News, 26 July 2022 Related: Boston has had a turnstile of superintendents. Globe Staff, BostonGlobe.com, 21 June 2022 Stimson and Smith both explained that something as seemingly innocuous as not cracking down on turnstile jumping can embolden criminals. Fox News, 2 June 2022 The guilty plea stemmed from an arrest in which Smith was caught jumping a subway turnstile in Coney Island, Brooklyn while carrying a handgun, officials said. Fox News, 11 May 2022 His Honda Pilot SUV traveled through the intersection and mounted the curb before hitting a SEPTA turnstile and the wall of the Kensington and Allegheny stations. Minyvonne Burke, NBC News, 10 May 2022 The zero-tolerance program aimed to provide services to homeless individuals and those experiencing mental health difficulties, and target loiterers, turnstile-jumpers and criminal opportunists. Fox News, 4 Mar. 2022 Grace, who won the under-nine Irish championship in the three-hundred-metre race last summer, approached a turnstile at eye level. Dan Greene, The New Yorker, 21 Feb. 2022 See More
The Editorial Board, WSJ, 28 July 2022 Three days later, the teen and a 16-year-old girl tried to jump a turnstile at the 125th Street station near Lexington Ave. Rebecca Rosenberg, Fox News, 26 July 2022 Related: Boston has had a turnstile of superintendents. Globe Staff, BostonGlobe.com, 21 June 2022 Stimson and Smith both explained that something as seemingly innocuous as not cracking down on turnstile jumping can embolden criminals. Fox News, 2 June 2022 The guilty plea stemmed from an arrest in which Smith was caught jumping a subway turnstile in Coney Island, Brooklyn while carrying a handgun, officials said. Fox News, 11 May 2022 His Honda Pilot SUV traveled through the intersection and mounted the curb before hitting a SEPTA turnstile and the wall of the Kensington and Allegheny stations. Minyvonne Burke, NBC News, 10 May 2022 The zero-tolerance program aimed to provide services to homeless individuals and those experiencing mental health difficulties, and target loiterers, turnstile-jumpers and criminal opportunists. Fox News, 4 Mar. 2022 Grace, who won the under-nine Irish championship in the three-hundred-metre race last summer, approached a turnstile at eye level. Dan Greene, The New Yorker, 21 Feb. 2022 See More Word History
First Known Use
1643, in the meaning defined above
Kids Definition
turnstile
noun
turn·stile ˈtərn-ˌstīl
: a post having arms that turn around which is set at an entrance or exit so that people can pass through only on foot one by one