the.com/reserve
The part of yourself, the wine, or the soldiers you're not spending yet.
means To hold something back for later use, or the supply, restraint, or formality kept in reserve.
from From Latin reservare, to keep back — re- (back) plus servare (to save or guard), the same root guarding your conserves and observers.
Emotional senseEnglish reserve as coolness dates to the 1600s.
Military reserveTroops deliberately held off the battlefield until needed.
Nature reserveLand set aside, not for you to bulldoze.