One who determines the odds on a horse or the line on a football game
[DOC] [TLE] Fixed-odds betting - Wikipedia [PAR] Fixed-odds betting is a form of wagering against odds offered by a bookmaker or 
an individual ... For example, if one were to bet $1 at 10 to 1 odds (one could win 
$10) on the outcome of a coin flip, one would be ... A lay bet is a bet that 
something will not happen so laying $50 on a horse is betting the horse will not 
win.