the.com/spoiled
What milk and rich children have in common: both went bad from too much sitting around.
means Either food gone rotten and inedible, or a person ruined by getting everything they ever wanted.
from From Latin spoliare, to strip or plunder — originally what soldiers did to the dead. The plundered thing was despoiled, then simply spoiled, until the word turned its aim from looted corpses to overindulged kids and forgotten leftovers.
Same rootSpoils of war shares this plundering ancestry.
ReversalYou ruin a child by giving, not taking.
Modern senseSpoiler alert borrows the idea of ruining.