The phrase "to save on" means to reduce costs or expenses in some way. It can refer to cutting back on spending, finding ways to conserve resources, or minimizing expenditures. The phrase is often used in a variety of contexts such as personal finance, business operations, and environmental conservation efforts. For example, someone might say they are "saving on energy costs" by using more efficient appliances or switching to renewable sources of power. Similarly, a company may aim to "save on production expenses" by implementing cost-cutting measures such as automation or outsourcing certain tasks. Overall, the phrase suggests finding ways to reduce spending in order to achieve greater efficiency and financial savings.