Student or Learner
Lines from《THE SHAWSHANK REDEMPTION》：
"And that's how it came to pass, that on the second-to-last day of
the job, the convict crew that tarred the plate factory roof in the spring of '49... ...wound up sitting in a row at ten o'clock in the morning, drinking icy cold beer courtesy of the hardest screw that ever walked a turn at Shawshank State Prison."
What does "walk a turn" mean?
I don't know much prison slang.
Is a "screw" a corrections officer? The person in charge of the prisoners?
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
4. A circuitous walk, or a walk to and fro, ending where it
began; a short walk; a stroll.
Come, you and I must walk a turn together. --Shak.
I will take a turn in your garden. --Dryden.
Taken from:to a turn - definition of to a turn by the Online Dictionary from Datasegment.com