It may also be unclear what "reversing" means here. You have to remember that most non-technical people don't think in the programmer style "input-output" way.
Say "reversing a hash" and the may think of reversing the string like abc->cba.
Often you cannot do better in explaining it without doing a mini course. And people would have to sit down, concentrate and work through the new concepts and that's tiring, looks like school, "I was never good at math", and you lost everyone. You can't make the average person understand hashing, mainly because the don't care and will glaze over. You can dress it up with engaging stories and metaphors, and they will remember the engaging story but not actually build the right mental model if you actually poke at their understanding.