Disclaimer - this post is absolutely off in the weeds. However, gun nerdery is fun, and I'm perfectly willing to ask dumb questions.
A phrase that is frequently used when describing modern pistol shooting is "lock your wrist." This is generally used to help explain how to set up your grip to mitigate recoil when firing. Often in short video clips or in articles it is glossed over as if this is just something you should already know how to do. I wanted to dig a little deeper. If a person "locks" their wrist, are they rotating their wrist to full ulnar deviation, or is locking the wrist simply increasing tension around the wrist joint so that it does not easily rotate? Said another way, is locking your wrist a skeletal position or is it phrase to explain the application of force? How do you determine this is a locked wrist position, and this is an unlocked(?) wrist position?