Wiktionary
vb. (context transitive nautical English) To unfasten (a hatch or door).
Usage examples of "undog".
Troy had when unloading cargo on the ground, the sol-pols undogged a circular roof hatch and swung the lid up.
He undogged the lock and swung the heavy metal door open, slipping inside and yanking it shut behind him.
When the water was at the halfway mark again, the captain bounded across the bell and undogged the door.
Gus watched as they undogged a thick, foot-and-a-half square door, drew out a slab on which the frost-covered body of a man lay under a thin plastic membrane.
When they reached the stern, others of the crew were already undogging the fastenings on the inner door of the dumper lock.
Foul, pressurized air rushed out of the Bonefish when he undogged the hatch.
He undogged the hatch and was almost mowed down by the Emassi who charged in, scowling and punching Chuck out of his way.
She undogs the hatchcover and pushes it open, hooking one calf through the ladder for purchase, her toe curled around a bar for a moment before she pulls herself forward and slithers through the opening like a nightcrawler into leafy loam.