Jagged Red or Green lines are showing up on some documents under specific
words. Can you tell me what causes this and how to turn it off ?
The red lines indicate spelling errors, and the green lines indicate
grammar errors. For a full explanation, ask the Help about "wavy
lines" and select the topic "What do the underlines in my document
mean?"
To hide them, right-click the book icon in the status bar (bottom of
the window) and click "Hide spelling errors" and "Hide grammatical
errors". To stop them altogether, go to Tools > Options > Spelling &
Grammar and uncheck both "Check spelling as you type" and "Check
grammar as you type".
It might be better, though, to leave the lines enabled and pay
attention to what they indicate. Word's spelling and grammar tools
aren't perfect, but most people aren't perfect and can use their
assistance.
Words that are correctly spelled but not recognized (proper names,
jargon, uncommon words) can be added to your custom dictionary. The
grammar tool is less flexible and more often wrong.