If you have ever mistakenly added a word to the Brave browser dictionary,
you need to manually edit the Custom Dictionary.txt
file.
As of March 2020, the Brave UI lacks a feature to do this.
This will depend on your OS. Google for where this is on your OS.
The file on macOS is at: ~/Library/Application\ Support/BraveSoftware/Brave-Browser/Default/Custom\ Dictionary.txt
.
Use your favorite text editor to edit and save the file.
I don't recall seeing a checksum unless that's new? Did you try closing and reopening (I know that sounds dumb)?
EDIT: Oh wow look at that. There is a checksum in there now... We'll need to check what the code in chromium is doing here: https://chromium.googlesource.com/chromium/src/+/refs/heads/main/chrome/browser/spellchecker/spellcheck_custom_dictionary.h#39