In-line expansion refers to the process of increasing the capacity of a production line without disrupting the existing flow of production. Synonyms for in-line expansion include capacity expansion, line extension, horizontal expansion, and process scaling. These terms all refer to the growth of a production line or process while maintaining the same level of efficiency and productivity. Other synonyms for in-line expansion include incremental expansion, stepwise expansion, and sequential expansion. All of these phrases convey the idea of gradual growth and development rather than a sudden, disruptive change. In-line expansion is an important strategy for businesses looking to increase their production capacity and improve efficiency.