(nautical) On the deck of a ship, especially of a captain or officer; in charge.
(baseball) Being the batter who will be up next, typically when that player is waiting on the field.
Jones is the on-deck batter.
I just love the feeling from the fans and when I'm walking on deck I can hear people screaming and wishing you the best. That puts you into the game more than anything. David Ortiz
I advise keeping four feet on the floor and all hands on deck. Ann Landers
Every evening at the same hour when the weather was calm, I used to go on deck and bless God for all the wonders of His creation. I loved to consider the care of God's Providence which extends even to the little fishes. Théodore Guérin
On the 17th of May, the Delos put out to sea. I was immediately affected with sea-sickness, which, however, lasted but a short time. I remained on deck constantly, forcing myself to exercise. John James Audubon
Lennon was not very fond of me. Lennon didn't like to be around somebody else who was likely to be the center of attention and didn't like being on deck with somebody who was intellectually as hot as he was. Peter Fonda
The man in mast, the hasty on deck. Finnish Proverb