At this point in the novel, Catherine is practically coerced into accompanying John Thorpe, Isabella, and her brother James in travelling to Bristol, taking John’s word of having already seen the Tilney’s leaving town earlier that morning. As they’re leaving, they spot the Tilney’s on their way to their planned engagement with Catherine. Catherine pleads for John to turn back and he ignores her, in which she replies to him with this quote. Pertaining to the social customs of the time, “A lady should never "cut" someone, that is to say, fail to acknowledge their presence after encountering them socially, unless it is absolutely necessary (Daniel Pool, What Jane Austen Ate and Charles Dickens Knew, 55). At face value, it appears that Catherine has slighted her dear acquaintances by ignoring them.