The phrase "percentage of one's revenue" refers to a proportion or fraction representing how much of an individual's, company's or organization's total income is contributed by a particular source. In other words, it indicates the percentage share of revenues that comes from a specific business activity or product line within the overall earnings generated by the entity in question. This metric can be used to evaluate the profitability and efficiency of different areas of operation, as well as to make strategic decisions about where to allocate resources for maximum return on investment.