What does dissemble mean in the story tell tale of heart and why it that?

Dissemble means to pretend or give a false impression. In "Tell-Tale Heart," the narrator is trying to dissemble his guilt and insanity. He is trying to convince the reader that he is sane and that he had a good reason for killing the old man. However, his efforts to dissemble are ultimately unsuccessful, and the reader can see through his lies.

Here is an example of dissembling in the story:

"Now this is the point. You fancy me mad. Madmen know nothing. But you should have seen me. You should have seen how wisely I proceeded -- with what caution -- with what foresight -- with what dissimulation I went to work!"

In this passage, the narrator is trying to convince the reader that he is sane and that he carefully planned the murder. However, his use of the word "dissimulation" shows that he is actually trying to hide something. The use of the word "dissemble" suggests that the narrator is trying to disguise his true motives and feelings. This creates a sense of tension and suspense in the story, as the reader begins to question the narrator's sanity and reliability.