A slippery slope is a small wrong step that leads to much worse ones. That is a slippery slope.
It is also the name of a fallacy, since the slide is asserted rather than shown. A slippery slope argument is only good when the steps between are actually likely.
1phrasea slippery slopeA small wrong step that leads to much worse ones.
“Letting one deadline slip is a slippery slope.”
a slippery slope is a phrase.
Practised in Idioms