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]

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]