Providing support, nourishment, or strength to maintain life or continued existence; keeping something going over time.
From Latin 'sustinere,' from 'sus-' (up from below) and 'tenere' (to hold). Literally means 'to hold up from underneath,' suggesting the support that keeps something from falling or failing.
Think 'sustaining' as 'sus-taining'—holding something up from underneath so it doesn't fall. Like pillars sustain a building, sustaining food holds up your energy levels.
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