What is what does lock and load mean?

“Lock and load” is a military term used to prepare for action, meaning to load ammunition into a firearm and prepare it for use. The phrase is derived from loading a bullet into the chamber of a gun and locking it into place before firing. It can be used to indicate readiness for any type of action or situation that requires preparation and quick response time. It has also been adopted into popular culture, often used in movies and TV shows as a catchphrase for action sequences.