hatch/haCH/verb1. (of birds, reptiles, fish, insects) to emerge from an egg.2. (in fine art and technical drawing) to shade with closely drawn parallel and/or perpendicular lines to create texture, value, and the illusion of form and light.3. to devise a plan.noun a small door or opening, allowing passage from one area to another.• a door in a submarine, airplane, or spacecraft.• an opening in the deck of a boat or ship leading to the cabin or a lower level.• an opening in a ceiling leading to a loft.