What does it mean to substain?

To sustain means to maintain or support something over time, ensuring its continuity or viability. This can apply to various contexts, such as providing resources for an ecosystem, supporting a community, or upholding a practice. Sustainability often involves balancing current needs without compromising the ability of future generations to meet their own needs. Ultimately, it reflects a commitment to preserving and nurturing systems for long-term health and stability.