| 1. | Nautical.
|
| 2. | an opening that serves as a doorway or window in the floor or roof of a building. |
| 3. | the cover over such an opening. |
| 4. | Slang. the throat as used for drinking: His usual toast was a muttered “Down the hatch!” |
| 5. | Aeronautics. an opening or door in an aircraft. |
| 6. | the lower half of a divided door, both parts of which can be opened separately. |
| 7. | a small door, grated opening, or serving counter in or attached to the wall of a building, room, etc., as for a merchant's stall. |
| 8. | a bin or compartment built into a confined space, esp. a deep storage bin. |
| 9. | Automotive.
|
| 10. | anything resembling a hatch. |
| 11. | batten down the or one's hatches,
|

batten down the hatches
Prepare for trouble, as in Here comes the boss
batten down the hatches. This term originated in the navy, where it signified preparing for a storm by fastening down canvas over doorways and hatches (openings) with strips of wood called battens. [Late 1800s]