Definition from Wiktionary, the free dictionary
Etymology 1 
hatch (plural hatches)
- A horizontal door in a floor or ceiling.
- A trapdoor.
- An opening in a wall at window height for the purpose of serving food or other items. A pass through.
- The cook passed the dishes through the serving hatch.
- A small door in large mechanical structures and vehicles such as aircraft and spacecraft often provided for access for maintenance.
- A opening through the deck of a ship or submarine.
- (slang) A gullet.
Derived terms 
trapdoor — see trapdoor
opening for serving food
small door provided for access for maintenance
narrow passageway between the decks
- (transitive) To close with a hatch or hatches.
- Twere not amiss to keep our door hatched'. — Shakespeare.
Etymology 2 
- (intransitive) (of young animals) To emerge from an egg.
- (intransitive) (of eggs) To break open when a young animal emerges from it.
- (transitive) To incubate eggs; to cause to hatch.
- (transitive) To devise.
- to hatch a plan or a plot; to hatch mischief or heresy
Derived terms 
to emerge from an egg
of an egg, to break open
to incubate eggs
- ^ Wolfgang Pfeifer, ed., Etymologisches Wörterbuch des Deutschen, s.v. “hecken” (Munich: Deutscher Taschenbucher Vertrag, 2005).
- The act of hatching.
- Development; disclosure; discovery.
- (Can we find and add a quotation of Shakespeare to this entry?)
- (poultry) A group of birds that emerged from eggs at a specified time.
- These pullets are from an April hatch.
- (Often as Mayfly hatch) The phenomenon, lasting 1-2 days, of large clouds of mayflies appearing in one location (to mate, having reached maturity).
- (informal) A birth, the birth records (in the newspaper) — compare the phrase "hatched, matched, and dispatched."
birds that emerged from eggs at a specified time
Etymology 3 
From Middle French hacher (“to chop, slice up, incise with fine lines”); Old French hachier
- (transitive) To shade an area of a drawing or diagram with fine parallel lines, or with lines which cross each other: cross-hatch.
to shade an area — see crosshatch