on deck adv. or
adj. phr. 1. On a floor of a ship open to the outdoors.
The passengers were playing shufflehoard on deck.
The sailors kept busy cleaning and painting on deck. 2. informal Ready to do something; present.
The scout leader told the boys to be on deck at 8:00 Saturday morning for the hike.
Dick was at bat, and Bob was on deck. [TahlilGaran] English Idioms Dictionary ▲