Dog 1
Dog 1 : (1) (Techn) a. A mechanical lever-type latch, such as one used to seal a watertight door. b. To seal such a door by engaging and securing the latches. (2) (Fire Pr) a. To secure a ladder or other equipment. b. A ratchet, pawl, or other device used to lock a ladder in extended position. See: Ladder. See also: Sparky