What Does a “Dry Run” Mean and Where Did the Term For a Practice Session Originate?

A “dry run” is firefighter jargon.

It was once common for firefighters, especially volunteers, to hold public exhibitions of their skills and to compete with other companies at fairs and carnivals.

This dry run gave the firefighters practice and was so called because no water was used.

A “fire run” or “wet run” is a call to an actual blaze.