The phrase "the thin end of the wedge" is commonly used to refer to a seemingly minor change or action that sets off a series of negative consequences. Synonyms for this phrase include "slippery slope,", "camel's nose under the tent," and "opening Pandora's box." Each of these phrases brings to mind the idea of a small and seemingly harmless entry point for something much larger and more dangerous. Other synonyms might include "a foot in the door", "a chink in the armor,", and "a crack in the facade." All of these phrases convey the idea that a small initial change can have significant and potentially disastrous implications.