S: (v) conserve (keep constant through physical or chemical reactions or evolutionary change) "Energy is conserved in this process"
S: (v) conserve, preserve, maintain, keep up (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"
S: (v) conserve, husband, economize, economise (use cautiously and frugally) "I try to economize my spare time"; "conserve your energy for the ascent to the summit"
S: (v) conserve (preserve with sugar) "Mom always conserved the strawberries we grew in the backyard"