Sign Up ( poker )

1) Get on the board for a particular game. "Did you sign up for the 15-30?" 2) Register for a tournament. "Did you sign up for the no-limit hold 'em at the Pasatiempo?"3) Give someone a signal, usually of someone else holdings; used by cheaters. "He signed him off" means that he gave his partner a signal that gave away the hand of another player that the signaler had managed to get a look at. Sometimes part of the phrase sign off a hand. Signing off is sometimes called piping.