| a dangerous and irreversible course: the slippery slope from narcotics to prison. |

| slippery slope n. A tricky precarious situation, especially one that leads gradually but inexorably to disaster: "[Without] a clear boundary to confer personhood on a human being ... we approach a slippery slope that ends in the disposal of inconvenient people" (Steven Pinker). |
slippery slope
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]