For a long time, I've read the advice to "roll your elbows in" to help control recoil while shooting an handgun. It's supposed to lock your hands together for a better grip. I tried it and it didn't work. Instead of locking my hands together, rolling my elbows in actually pulled my hands apart. Worse, my elbows were now horizontal and tended to bend upward during recoil.
Recently, I watched a video by Warrior Poet Society. He gave a couple of tips on how to control recoil to get back on target quicker. He talked about "rolling the elbows in" and demonstrated the technique by rolling his elbows out.
At least, that's how I think of it. I took up archery when I was very young and our coach taught us that if we didn't roll the elbow of our bow arm out (from the horizontal to vertical) and out of the path of the bow string, it would slap the arm painfully. Our coach told us to roll the bottom of out elbow out. When the bottom of the elbow is rolled out, the top of the elbow is rolled in. A small thing perhaps, but for me, an illuminating moment as I finally grasp the concept.
It also reminded me that, while we often take it for granted we all speak a common language, we don't always speak the same language.