Knight of Cups
Upright
Arrival, approach—sometimes that of a messenger; advances, proposition, demeanour, invitation, incitement.
Reversed
Trickery, artifice, subtlety, swindling, duplicity, fraud.
A. E. Waite, The Pictorial Key to the Tarot (1911), Part III §2The picture
Graceful, but not warlike; riding quietly, wearing a winged helmet, referring to those higher graces of the imagination which sometimes characterize this card. He too is a dreamer, but the images of the side of sense haunt him in his vision.
Older readings
A visit from a friend, who will bring unexpected money to the Querent. Reversed: Irregularity.
A. E. Waite, The Pictorial Key to the Tarot (1911), Part III §4. Waite collected these and says they often disagree with the main meanings.Waite wrote in 1911 and some of his meanings show it. Tarot is a tradition of reflection, not a prediction, and no card decides anything for you.