esti f (plural estis) 1  Alternative form of. â 2 estiâ in le TrÃ©sor de la langue franÃ§aise informatisÃ© (The Digitized Treasury of the French Language).
Frame dragging is a theory which says that space is elastic, and particles in it will exchange energy with it. In the scientific world, elastic means that when you apply a certain amount of force to an object (which will cause it to bend) and then remove the force, the object will return to its original shape and energy state.
The coach pivots on the drive axle in a turn and the tag wheels get dragged sideways. That is sometimes called tail-dragging, but that is confusing because tail dragging also refers to literally bottoming out the chassis on a dip in the road. And a tag usually prevents that sort of thing.