If you have dreamed of Buying a Pocket Knife: Your desire to make new beginnings or take initiatives is increasing, People who try to market you something or persuade you on some issues may be far from convincing. To see of buying a knife in a dream indicates that it will make the dreamer very angry and infuriated.
To see a knife in a dream means that it will anger the dreamer, infuriate him, and if he acts with greed, he will hear such bad words that he will become a murderer and he will go mad with anger.