1.NounA chain of events that, once initiated, cannot be halted; especially one in which the final outcome is undesirable or precarious.
"I think basing your actions off an assumption like that is a slippery slope that is going to get you in trouble.; She's gotten herself on a slippery slope to being dismissed."
2.NounA logical fallacy in which a party asserts that a particular result will probably follow from a given decision or circumstance, without necessarily providing any rational argument for the likelihood of the assumed consequence.