I have two MacBook Pros, both running El Cap 10.11.6. One is several years old, one is about 6 months old, but only been in use for about 3 weeks. I use Safari quite a bit, and at some point, the older Mac learned a spelling "correction" that was both unique and incorrect. That correction shows up as a standard text box with an X just below the text entry box with the misspelled word. I still can't figure out how to make it disappear, or otherwise unlearn that word. If someone knows, that would be nice. It's NOT in ~/Library/Spelling. But that's not why I'm posting. Here's why I'm posting: On the NEW Mac, Safari seems to know that SAME unique and incorrect spelling "correction". How is that happening? I did NOT do a data migration between machines. I DID export Safari bookmarks and import them into the other Safari, via USB drive. The newer Mac is NOT logged into my iCloud. Any ideas?