A Freudian symbol for sexual passion.
A knife being used to sever anything in two implies the impending end of a relationship of any kind – business, friendship, love.
A rusty or dull knife implies the dreamer’s lack of ability to sever a relationship that is not serving her.
Cutting yourself with a knife warns that situations may arise where you become your own worst enemy.
Astrological parallel: Mars Tarot parallel: The suit of swords