conserve (v.)

"to keep safe, preserve from loss or decay," late 14c., from Old French conserver (9c.), from Latin conservare "to keep, preserve, keep intact, guard," from assimilated form of com-, here perhaps an intensive prefix (see com-), + servare "keep watch, maintain" (from PIE root *ser- (1) "to protect"). Related: Conserved; conserving.

As a noun (often conserves) from late 14c. as "that which preserves;" early 15c. as "a confection, something preserved with sugar, etc."

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Definitions of conserve
conserve (v.)
keep constant through physical or chemical reactions or evolutionary change;
Energy is conserved in this process
conserve (v.)
keep in safety and protect from harm, decay, loss, or destruction;
children must be taught to conserve our national heritage
The museum curator conserved the ancient manuscripts
Synonyms: preserve / maintain / keep up
conserve (v.)
use cautiously and frugally;
conserve your energy for the ascent to the summit
Synonyms: husband / economize / economise
conserve (v.)
preserve with sugar;
Mom always conserved the strawberries we grew in the backyard
conserve (n.)
fruit preserved by cooking with sugar;
Synonyms: preserve / conserves / preserves