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A situation in which some behavior or action will eventually lead to a worse form of the same behavior or action, or a disastrous outcome. Eating that piece of cake is a slippery slope that could lead to you completely abandoning your diet. Verbal abuse is often a slippery slope that leads to physical abuse.
a dangerous pathway or route to follow; a route that leads to trouble. The matter of euthanasia is a slippery slope with both legal and moral considerations.
A dangerous course, one that leads easily to catastrophe, as in He's on a slippery slope, compromising his values to please both the bosses and the union . This metaphoric expression alludes to traversing a slick hillside, in constant danger of falling. [Mid-1900s]
a slippery slope
COMMON A slippery slope is a course of action which is likely to lead to failure or serious trouble. It's a slippery slope. You give in to one demand and soon find that you're doing exactly what they want. The company started down the slippery slope of believing that they knew better than the customer, with the inevitable disastrous results. Note: You can also say that someone is on a slippery slope or on the slippery slope. These young people may already be on the slippery slope to criminality.
slippery slopean idea or course of action which will lead inevitably to something unacceptable, wrong, or disastrous.
1998 Spectator Those of us who feared that devolution would not assuage nationalist sentiment but turn out to be the slippery slope to separatism have a good chance of being proved right.