If you conserve a supply of something, you use it carefully so that it lasts for a long time. The republic's factories have closed for the weekend to conserve energy. = save
Anything which is conserved; especially, a sweetmeat prepared with sugar; a confection
keep in safety and protect from harm, decay, loss, or destruction; "We preserve these archeological findings"; "The old lady could not keep up the building"; "children must be taught to conserve our national heritage"; "The museum curator conserved the ancient manuscripts"