Spot lines are a type of advertising that uses short, catchy phrases to draw attention to a product or service. They are often used in radio and television commercials, as well as in print ads. The term 'spot lines' comes from the fact that they are usually delivered in a very short amount of time, often just a few seconds. The answer to the crossword is 'JINGLE, ' which is a type of spot line that uses a musical phrase to draw attention to the product or service being advertised.