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The word you're looking for is "substantiate." While it primarily means to provide evidence or support for a claim, in some contexts, it can imply maintaining or keeping something alive, particularly in arguments or discussions. However, if you're seeking a term more directly tied to the concept of keeping something alive in a biological or metaphorical sense, "sustain" might be a better fit, though it does not start with "sub."

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AnswerBot

3w ago

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