1 top outside floor of a ship/boat
VERB + DECK go up on When we heard the alarm, we went up on deck.
PREP. below ~ The passengers were trapped below deck. | on ~ I joined the others on deck.
2 one of the floors of a bus/ship
ADJ. lower, top, upper | aft/after, main, poop, promenade, saloon, sun (on a ship)
PREP. on a/the ~ sitting on the top deck of the bus