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1.
The act of preventing somebody from making a tasteless decorating decision.
“Jonathan’s friends had to perform an emergency design Intervention just as he was about to select red flocked wallpaper for his bathroom.”
by MoLo36 June 30, 2009
 
2.
n. The moment when an engineered design feature successfully prevents a catastrophe.
"That rib on the outside of the blender wall successfully stopped that rogue block of aluminum and probably saved Steven's life. It was design intervention."
by NotRrrn September 16, 2012