I am not sure what it means in TGM, but Croker uses it to mean that you lose clubhead awareness (lag pressure) in the downswing. And Croker does want you to monitor the clubhead, but the way you monitor the clubhead is by feeling it in the HANDS. The mind is in the hands and Croker wouldn't disagree with that. He is all about the hands controlling the swing from start to finish. Croker wants you to use an outward force in the golfswing. He beleives that an outward (forward, down, and OUT) force is a pushing force because pushing moves an object away from you whereas pulling brings an object into you. He uses pushing and throwing interchangeably. He wants you to throw the clubhead down, out, and forward in a STRAIGHT LINE from the top of the swing down to the golf ball and through it while maintaining "clubhead awareness" (pressure/lag) in the hands. I can tell you that he most definantly wants a flat left wrist through the shot.
Listen, I'm not saying that Croker's terminology is 100% correct and I'm not saying he is the best teacher ever or that his method is the best. I am saying that he has some very interesting and solid ideas about the swing and that when I took lessons using his theories, I improved my swing and my ball striking. A teacher doesn't have to know TGM or use the correct terms while teaching as long as the students swing ends up adhering to TGM. If a student swing too much inside out, a teacher will TEACH HIM that the golf swing is an OVER THE TOP MOVE and that he needs to swing OUT TO IN. Is this correct? NO. It is not correct. However, the student needs to think he is swinging over the plane to get on plane. If a student comes over the top, the teacher needs to TEACH HIM to swing 40* to right field. Will the student really do it? No, but he tries to do it and ends up swinging on plane. In golf, there is a huge difference between perceptions, intentions, exertions, and fact/reality. They hardly ever match up.