Would you be kind enough to give me your considered opinion concerning my interpretation of the expressions in bold in the following sentences?
I always tell my girl to make sure beforehand that she has a good man or true, and the chance will neither make her nor break her. (Ch. Dickens, “Barnaby Rudge”)
Certain critics are so influential that they can make or mar a book. (W. I. Maugham, “A Writer’s Notebook”)
She knew that the men in the mining world, whit whom she talked politely, could make or break Dick as suited their purposes. (K. S. Prichard, “Golden Miles”)
make or break = make or mar = bring fame to or bring to naught
Mend your speech a little, lest it may mar your fortune. William Shakespeare
Read more: mar: Definition, Synonyms from Answers.com
Please, excuse my lack of discretion.