Question

What does the proofreading mark "..." mean?

Answer 1

Usually the elipsis means leaving out a specific word or phrase from the sentence would allow the sentence to flow better.

People tend to use elipsis to give a “trail off” effect to a sentence or to purposefully not use a specific word due to its symbolism in the text

Answer 2

I believe "..." means that you need to go further in depth with your writing.