- I. abbreviation
open to buyII. abbreviationofftrack betting
* * *offtrack betting.
* * *OTB (no periods),off-track betting (a state-licensed system in the United States for placing bets on race horses away from the race track): »
Seems that the OTB computers that are linked with those at the race track developed a colic or something, and wagers at the fourteen shops around town had to be recorded manually (New Yorker).
* * *abbr. off-track betting
Useful english dictionary. 2012.