What does it mean when my audi cars motor jumps when i change gears?

I have a 1998 audi A4 atomatic and its been giving me this problem when i slow down it jerks and when a change gears the motos jumps.what could it be???What does it mean when my audi cars motor jumps when i change gears?Your tranny is wearing out, go to the shopWhat does it mean when my audi cars motor jumps when i change gears?The transmission is slipping, take it to a shop.