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]
(..) She will kill everything that moves. Do you think the animal is contemplating its own existence? She is learning where she fits in the food chain... and I'm not sure you want her to figure that out. Now, Asset Containment can use live ammunition in an emergency situation. (..)2015 Jurassic World