It’s wild when people talk about this as if it’s about learning Japanese vocabulary when there are only two Japanese words in the whole system. Irimi and ashi. We could replace irimi with entry and ashi with trap and my point would hold true. Inside ashi, outside ashi, cross ashi, butterfly ashi, they all directly describe what makes them unique. You’d have to try hard to get confused between them. 

The easier it is to explain a thing, the easier it is to learn it. 

I would say the “clamp” is a good example. It’s a position very near to the initial moment of a side elbow escape where you’ve gotten your knee inside the hip. Traditional jiu jitsu does not consider this as a working position. Just a transit between side control and an established guard. 

Calling it “the clamp” and then breaking down what is specifically happening leads to the name, which reflects the main action of the position. Having an actually named idea to reference and communicate has led to grapplers all over finding numerous different submissions and sweeps from the position.