A farmer's tan is a common phenomenon that occurs due to prolonged exposure to sunlight. It is characterized by the development of tan lines on the skin, which occur due to the contrast between the tanned and untanned areas of the body. However, there are many synonyms that describe this condition, such as cyclist's tan, trucker's tan, golfer's tan, and tennis tan. These terms are used to describe the same phenomenon of having a tan in specific areas of the body due to extended exposure to the sun while performing certain activities. Other synonyms for a farmer's tan include sunburn, tanning lines, and UV exposure lines.