Glossary
Reverse line movement
Reverse line movement is when a betting line moves in the opposite direction of where most of the tickets are landing. If the majority backs one side but the number shifts toward the other, it hints that a smaller amount of sharper money is outweighing the public count.
Normally you would expect a line to move toward the popular side. If most people are betting the Mesa Miners, the book should shade the Miners' price to balance its risk. Reverse line movement is the surprise: the tickets pile onto the Miners, yet the number drifts toward their opponent instead.
The explanation is that ticket count and money are not the same thing. A book may take a hundred small bets on one side and a handful of large, respected bets on the other. If the big money outweighs the crowd, the line follows the money, not the headcount. That is why this pattern is watched as a possible sharp signal.
Reading it carefully
Say the Miners open at -2.5 and public bets run heavily their way, but the line quietly slides to -1.5. The move against the crowd suggests informed money likes the other side. It is a hint, not proof, because you rarely see the full picture behind a book's numbers.
Context beats the pattern
Reverse line movement is easy to over-read. Injuries, weather, and lopsided limits can all move a line without any sharp opinion involved. Use it to ask better questions, not to hand your judgment to the ticket counter.
A sharp coordinated version of this move showing up across books at once is steam, and the crowd it runs against is the public betting side.