Not the most splashy of new hints, but one of my favorite new features is having spell check 'unlearn' a word. I have often been too quick to add a word to my spelling list, to only later see that I missed a letter or something. Now you can select a word, control-click on it, and choose Unlearn from the pop-up menu. Obviously this only works with words in the personal spelling list. [robg adds: When I first tried to test this, I couldn't get it to work. That's because I was testing it in Mail, which will happily let you add a word to the Dictionary ... but they seem to have left out the unlearn ability. So I switched to TextEdit, typed in my incorrectly-learned word, control-clicked on it, and saw the Unlearn menu item. So you may find this doesn't work in every app; Mail and TextEdit are the only two I tried it in. Worst case, though, you can switch to TextEdit,...

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