(hach) noun
1. Naut. a An opening in the deck of a vessel affording passage to the hold, as for cargo, etc.: also called hatchway. b The cover over a hatch.
2. Any similar opening in the floor or roof of a warehouse or other building, or the cover or grating for such an opening.
3. A door or gate with an opening above; a divided door; wicket.
4. A sluice gate. [OE hæcc grating]

(hach) v.t.
1. To bring forth (young) from the egg by incubation.
2. To bring forth young from (the egg).
3. To devise, as a plan; contrive secretly, as a plot.
—v.i.
4. To emerge from the egg.
5. To produce young.
—noun
1. The act of hatching.
2. The brood hatched at one time.
3. The result or outcome of any plan. [ME hacchen; origin uncertain]

(hach) v.t.
To mark with hatchings.
—noun A shade line in drawing or engraving. [<OF hacher chop <hache an ax <Gmc.]