Meaning : Keep constant through physical or chemical reactions or evolutionary change.
Energy is conserved in this process.
Meaning : 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.
Meaning : Use cautiously and frugally.
I try to economize my spare time.
Conserve your energy for the ascent to the summit.
Meaning : Preserve with sugar.
Mom always conserved the strawberries we grew in the backyard.