Something that will never happen or is highly unlikely.
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A strong way of saying something will absolutely never happen.
When you say not in a million years, you mean it is simply impossible and you'd never do it.
It's often used to refuse firmly or brush off an idea.
"Over My Dead Body"
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A dramatic refusal — you would physically prevent it from happening
"When Pigs Fly"
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Say something will never happen, but in a playful or humorous way
"Not (never) in a Million Years"
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This will never happen or I would never do it