Origin: Combined from the heart radical (忄) for emotional bearing and 昔 (xī, past) as a phonetic indicator, originally capturing the sentiment of looking back at the past with lingering affection or regret.

Semantic Evolution: Shifted from emotional regret or remembrance toward active cherishing, valuing, and sparing use of precious resources.

• The component 昔 originally depicted dried meat drying under the sun, symbolizing bygone times.