Classic reading: A foreign lover for a single woman or widow (with a heart: many virtues; with a club: kind and generous; with a diamond: bad-tempered, demanding and jealous; with a spade: undesirable). Also a dark young man, an unfaithful friend, a dealer, a boyfriend; with the Jack of Spades: bad intentions. Reversed: tries to stir up conflict with the faithful friend.
General meaning
Upright
young foreignermessengerbetrayalunfaithful friendboyfriend
↕ Reversed: A stirrer of conflict, betrayal losing strength, bad advice.