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]
(..) Dialogue: ..,Default,,,I found it in the\Nvictim's pocket. Dialogue: ..,Default,,,She wasn't wearing it?\NNope. Dialogue: ..,Default,,,And the chain is broken,\Nwhich could tell us something Dialogue: ..,Default,,,about how she died. Plus... Dialogue: ..,Default,,,There's an inscription on it. (..)2016 TvShow: Bones Title: The Death in the Defense Season: 11 Episode 11