Idiom
on a slippery slope
in a situation that is likely to become more difficult or complicated.We started arguing, and then we got on the slippery slope of what's fair and what's not fair.So far, we have taken only the first few steps toward a society in which different people would have different rights, but we are on a slippery slope.
Usage notes: sometimes used without on:
Where does this slippery slope end?