My point is that any intimacy with a particular activity gives rise to it's particular vocabulary and may measure the user's capabilities. I was manuevering my MLB to rescue a drifting pleasureboat drifting sternfirst into the rocky jetty. I loudhailed for one of the occupants to go to the bow and catch the line we were going to throw. They didn't have a clue ( as I learned later) and decided I was trying to say 'BACK.' The result was all 5 people went to the stern and swamped the boat.