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]
(..) see her again. You will spend the rest of your days in the dungeons. And what of Thor? You'll make that witless oaf king while I rot in chains. Thor must strive to undo the damage you have done. He will bring order to the Nine Realms and then, yes... (..)2013 Thor: The Dark World
(..) If only we could. But its power is too great. Bury it deep. Somewhere no one will ever find it. (CHAINS CLANKING) Loki. Hello, Mother. Have I made you proud? Please, don't make this worse. Define "worse." (..)2013 Thor: The Dark World