NFL gambling tips: As Bears, Seahawks and Panthers struggle on offense, bettors converge on unders

The object in establishing a point spread and over-under total is to seek a balanced response from the bettors, the rationale being that the bookmaker will collect from the losing side and the 10 percent in juice from each wager. 

This week’s NFL action, particularly on totals, has exposed the books to some serious liability as bettors are loading up on sides and shifting the figures dramatically in some cases. 

Caesars Sportsbook, for instance, reports that after it established the over-under for the 49ers-Bears game at 43.5 points, a groundswell of bettors pounced so abundantly on the under that it has dipped all the way to 39.5.

CARDS PARLAY:Arizona sports betting scorching amid Cardinals' hot start

NFL STATS CENTRAL: The latest NFL scores, schedules, odds, stats and more.