Green’s Dictionary of Slang

deck n.1

[orig. naut. use]

1. [mid-19C; 20C+] (orig. US) the floor, the ground.

2. [mid-19C–1950s] the roof of a train or stagecoach.

3. [1950s] (US black) the street.

In phrases

hit the deck (v.)

1. [1910s+] to get up from one’s bed.

2. [1920s+] to fall down, to throw oneself down.

3. [1920s+] to go to bed.

4. [1930s+] to be poor.

5. [1950s+] (Aus.) to pay for a round of drinks.

SE/sense 1 above, in slang uses

In phrases

on deck [naut. imagery] (US)

1. [late 19C–1910s] on the schedule, scheduled.

2. [late 19C–1910s] alive; conscious.

3. [late 19C+] available, prepared.

4. [1940s] present.

on the deck [milit. use on the deck, at ground level]

[1920s+] bankrupt, without funds.