What is the meaning of a red wavy underline that appears under text in a publication?

The answer is "Misspelled word is red wavy underline."

Explanation:  

The red wavy emphasis is the misspelling in Microsoft Word. It also involves adding a new word in a document parser and other text editors.  Red wavy underline typically is used as a spelling mistake, mistake form and missed word for correcting the term. To right-click on the word to correct these words, and it will list suggestive words in which we select an appropriate word.