The phrase "corkscrew" refers to a tool used for removing corks from bottles, usually wine bottles. It has a spiral shape that goes into the cork, allowing you to twist it and pull the cork out. Full definition
As just mentioned the natural inclination of your body is to turn away from the bar so use your free arm and shoulder to turn in to it (imagine your body is a human cork screw and you will get the idea) (unique-bodyweight-exercises.com)
The natural inclination of your body is to turn away from the bar so use your free arm and shoulder to turn in to it (imagine your body is a human cork screw and you will get the idea) (unique-bodyweight-exercises.com)