From The Collaborative International Dictionary of English v.0.48 :
Seven-up \Sev"en-up`\, n.
The game of cards called also all fours, and old sledge.
[U. S.]
[1913 Webster]
From WordNet (r) 3.0 (2006) :
seven-up
n 1: a form of all fours in which a total of seven points is
game [syn: seven-up, old sledge]