“Meander” began as the name of the Maeander River, known for its bends, and later came to mean a winding path or indirect speech.

“Move the goalposts” began as a sports image. Today it means changing the target or standards after someone has already met them.

“At the drop of a hat” means immediately. Here is the likely origin and how to use this common idiom naturally today.

Amid usually means surrounded by a scene or atmosphere. Among usually means included within a group of people or things.

“Behind the eight ball” began in pool, where the 8 ball could block your shot. That image later came to mean being in a difficult position.