A situation likely to lead to something worse.
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A situation that is likely to lead somewhere worse.
When you call something a slippery slope, you warn that one small exception makes the next one easier.
It's used to argue against changes that look harmless on their own.
"The Last Straw"
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The final thing that ends your patience
"Open a Can of Worms"
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Start something complicated and messy
"A Slippery Slope"
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One step leading somewhere worse