To sustain means to keep something going or to support it over time. It can refer to supporting life, continuing an effort, or maintaining a sound or action.
From Old French 'soustenir', from Latin 'sustinere' meaning 'to hold up, support', from 'sub-' (from below) and 'tenere' (to hold). The core idea is holding something up so it doesn’t fall or stop.
Sustain is the quiet work behind every success story—you don’t just start; you keep going. From holding a musical note to running a long project, sustain is about turning moments into continuations.
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