- (old-fashioned) (in a pack of cards)
a jack (= a card with a picture of a young man on it, normally worth more than a ten and less than a queen) the knave of clubs 梅花 J
- (old use)
a dishonest man or boy 不诚实的男人（或男孩）；无赖；恶棍
Word OriginOld English cnafa ‘boy, servant’, of West Germanic origin; related to German Knabe ‘boy’.