1. Literally, to be born by emerging from an egg. The class gathered around as the baby duckling hatched out of its shell.
2. To devise or organize something, especially in secret. In this usage, a noun or pronoun can be used between "hatch" and "out." We hatched out a plan to steal the diamonds from the museum. We hatched the scheme out behind the boss's back.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.