Below is a link to an interview of Capt. Jack Andrews and Gina Fiore. Here is a quote of Jack you can find at the 19:30 mark:

"There's multiple ways to be a sharp sports bettor. The two terms we use are Top/Down and Bottom/Up."

Jack goes on to explain that Top/Down is using a sharp source like Pinnacle then finding and betting lines in the other books that are off from the Pinnacle/sharp line. I've heard this same thing repeated by several noted sports bettors.