noun

• (nautical) An opening through the deck of a ship or submarine
• (slang) A gullet.
• (Scotland) A bedstead.
  "It consisted of a rude wooden stool , and still ruder hatch or bed-frame"
• (mining) An opening into, or in search of, a mine.

verb

• (transitive) To close with a hatch or hatches.
  "'Twere not amiss to keep our door hatched."

verb

• (intransitive, of young animals) To emerge from an egg.
  "These three chicks hatched yesterday morning."
• (intransitive, of eggs) To break open when a young animal emerges from it.
  "She was delighted when she heard the crackling sound of the eggs hatching."
• (transitive) To incubate eggs; to cause to hatch.
  "I'm hatching this mysterious egg I found in the forest."
• (transitive) To devise (a plot or scheme).
  "World domination was only one of the evil schemes he had hatched over the years."

noun

• (figurative) Development; disclosure; discovery.
  "There's ſomething in his ſoule? / O'er which his Melancholly ſits on brood, / And I do doubt the hatch, and the diſcloſe / Will be ſome danger, which to preuent / I haue in quicke determination"
• (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.
  "a. 1947, Edward R. Hewitt, quoted in 1947, Charles K. Fox, Redistribution of the Green Drake, 1997, Norm Shires, Jim Gilford (editors), Limestone Legends, page 104, The Willowemoc above Livington Manor had the largest mayfly hatch I ever knew about fifty years ago."
• (informal) A birth, the birth records (in the newspaper).
  "hatch, match, and dispatch"