Protesters formed 'a human chain' [=they stood next to each other with their arms linked] around the ancient tree to prevent it from being cut down.
In the United States, the President as the commander in chief is at the head of the military 'chain of command'.
I thought he really won the lottery but he was only 'pulling my chain'. [=he was only playing a joke on me]
(..) No, but everything is gonna be all right. You must be Lord Caldlow? Caldlow. Yes, I am. I always have been. They flatter you with all those chains. Don't they know you can't escape without your rubber ball? I pulled you out... out of that tank. All I wanted to do was prove (..)2006 The Prestige