From Wiktionary, the free dictionary
From super- + accept.
superaccept (plural superaccepts)
- (bridge) A strongly encouraging response to a transfer.
2008 March 3, Phillip Alder, “In Las Vegas, It’s All About the Odds”, in New York Times[1]:South’s jump to three spades, a superaccept, announced four-card spade support, a maximum and (typically) a doubleton somewhere.