n.1. a. A structure or shelter made or used by a bird to hold its eggs during incubation and to house its young until fledged.
b. A structure or shelter in which other animals, such as reptiles, fish, or insects, deposit their eggs or tend their young.
c. A structure or complex built by ants, termites, or other social animals to house a colony.
d. A number of insects, birds, or other animals occupying a nest: attacked by a nest of hornets.
2. A place affording snug refuge or lodging; a home.
3. a. A place or environment that fosters rapid growth or development, especially of something undesirable; a hotbed: a nest of criminal activity.
b. Those who occupy or frequent such a place or environment.
4. a. A set of objects of graduated size that can be stacked together, each fitting within the one immediately larger: a nest of tables.
b. A cluster of similar things.
5. A group of weapons in a prepared position: a machine-gun nest.
v.intr.1. To build or occupy a nest.
2. To create and settle into a warm and secure refuge.
3. To hunt for birds' nests, especially in order to collect the eggs.
4. To fit one inside another.