This guide will show you how to turn off the annoying red underlines and green squiggle lines that are part of the spelling and grammar check that MS Word automatically does by default. Doing the steps in this guide will not affect your ability to run a spell check, you will still be able to do that.his guide will show you how to turn off the annoying red underlines and green squiggle lines that are part of the spelling and grammar check that MS Word automatically does by default. Doing the steps in this guide will not affect your ability to run a spell check, you will still be able to do that.