How to Add Words & Spellings to macOS Spellcheck
You would think your Mac should know every word and spelling you throw at it since it must have a huge vocabulary. However, that is not always the case. Every so often, you'd see something you type highlighted with a dreadful red dotted line below it. The line means either you just made a typo, or macOS does not know the word. If you did type correctly and want it remembered for the future, here's how you can add the word or spelling to macOS Spellcheck.