If the card is upright, it represents change and new excitements, particularly of a romantic nature. It can mean invitations, opportunities, and offers. The Knight of Cups is a person who is a bringer of ideas, opportunities and offers. He is constantly bored, and in constant need of stimulation, but also artistic and refined. He represents a person who is amiable, intelligent, and full of high principles, but a dreamer who can be easily persuaded or discouraged.
Reversed, the card represents unreliability and recklessness. It indicates fraud, false promises and trickery. It represents a person who has trouble discerning when and where the truth ends and lies begin.