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I would only use the term cocked and locked to refer to a 1911 or similar single action auto. I have always thought the term locked meant that the slide was in battery with a round in the chamber, based on my military training. I was always taught that the proper term for readying a rifle on the military range was to load and lock, with load meaning to insert a magazine into the weapon and lock being to allow the slide to go forward making the weapon ready to fire.

But, I can see how it could be used to signify that the safety is on also. I have no argument there. I just cannot see how any Glock could ever be called cocked.

And, for an aside, it looks like the term locked has changed meanings many times over the years. According to this article on it, the term locked and loaded was first used in the late 1700s in reference to flintlock rifles. It makes sense to me that it had a different meaning them because the question would refer to having the flint in position to be used. Fortunately, we no longer need to worry about that use of the term.