A knife is a symbol of division. There may be something in life that needs to be cut out and got rid of. Alternatively, the knife may be representative of the need to view something from a dual perspective the spiritual and the physical. It can be important in a dream about a knife to notice what type is being used. For instance, a table knife would be interpreted very differently to a Swiss Army knife. Both are functional, but the former would only be appropriate under certain circumstances, whereas the latter might have a more universal application. To dream that we are carrying a knife signifies anger, aggression and/or separation. We may be attempting to cut ties or feel that we need protection. If we are using a knife we may either be freeing ourselves from restrictions or trying to sever a relationship. If we are being attacked with a knife, it indicates either violent words or actions may be used against us. If we are aware that the knife is blunt, the words may be particularly hurtful. If sharp, matters can be dealt with quickly. In a woman's dream the symbol of a knife is probably more to do with her own fear of penetration and violation, whereas in a man's dream it is highlighting his own aggression. You might like to consult the entries for Dagger and Weapon for further information.