noun
a mechanical gate consisting of revolving horizontal arms fixed to a vertical post, allowing only one person at a time to pass through
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The crowd patiently waited in line to pass through the turnstile at the entrance of the stadium.
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Make sure you have your ticket ready to scan at the turnstile before entering the concert.
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I managed to sneak past the turnstile without paying by pretending to be on my phone.
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The new security measures acted as a turnstile, allowing only authorized personnel to enter the building.