five will get you ten

In all likelihood; chances are good that. Taken from betting parlance for even odds, i.e., a successful bet of five (dollars, etc.) will give you five back, leaving you with ten. I know there's some suspicious activity going on in this company; five will get you ten the boss is cooking the books. Five will get you ten that Jonathan is having an affair. Yeah, they seem happy now, but I think it's all an act. Five will get you ten that they're divorced in a few years.