Monolingual mac 10.9
Considering that every app includes localization files of some sort, it’s possible to regain some storage space by removing localization languages.
When you are really tight on disk space, every megabyte counts. If it's off, then the checkmark won’t be shown.Uncheck “Correct Spelling Automatically”.In the app you’d like to disable autocorrect, click on the Edit menu.You don't have to disable autocorrect system-wide if it’s only in one application where it annoys the most, because this feature can still be highly useful in most situations.
Uncheck the box next to “Correct spelling automatically”.From the Apple menu launch System Preferences.In earlier versions of OS X the location of autocorrect may be different, but you'll likely find it under Language & Text options. In macOS 10.13 High Sierra, 10.12 Sierra, OS X 10.11 El Capitan, 10.0 Yosemite, and OS X 10.9 Mavericks, the feature is located in the same place. Disable Autocorrect in macOS High Sierra or Earlier OS up to OS X Mavericks The good news is – whether you enjoy it or find it annoying – autocorrect can be disabled very quickly. If you regularly encounter unwanted auto-edits, it's because the language priority has been set to a certain language and that prompts macOS to inaccurately correct the spelling to the prioritized language. It might be autocorrect's erroneous corrections of British English words into American English words or vice versa, or other such reasons that could drive you nuts. The appreciation of this feature is highly subjective though, because how effective it is depends on how you type, how accurate you are and how often you might type untypical words. However, this feature can range from awesome to annoying – it works just fine in an attempt to automatically correct typos and misspellings, because it instantly compares your words against an extensive dictionary. It's very easy to get your spelling checked while you're typing in macOS.