A person who solicits business, employment, support, or customers in a persistent or annoying manner. The tout outside the concert venue was trying to sell tickets at a higher price.
A person who buys up tickets for an event to resell them at a profit. The tout managed to sell all his tickets for the football match at double the original price.
A person who offers racing tips for a fee. The tout claimed to have insider information on the horse race, promising big wins for those who paid for his tips.
A piece of inside information or a tip, especially regarding the likely outcome of a horse race. He placed his bet on the favourite after getting a tout from a stable hand.