Juggernaut started as Jagannath, a title of Krishna, then changed in English into a word for an overwhelming, unstoppable force.

“Cat’s paw” means a person used by someone else for a risky or dishonest purpose. The image comes from a fable about chestnuts in a fire.

This expression began with a literal axe in an old story. Now it usually means someone has a personal motive or private agenda.

Use hung for objects and ordinary positions. Use hanged only for execution in legal or historical contexts.