conserve
verb (used with object)
to prevent injury, decay, waste, or loss of.
Used to describe an ongoing action or continuous state that will be taking place in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
On freshness alone, he's surely going to want to jump and run, and the problem will be conserving his energy as much as anything.
From The Guardian ● Jul. 13, 2010