on deck
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.
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Source: A Dictionary of American Idioms
