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a pocketlike, usually more or less circular structure of twigs, grass, mud, etc., formed by a bird, often high in a tree, as a place in which to lay and incubate its eggs and rear its young; any protected place used by a bird for these purposes.

a place used by insects, fishes, turtles, rabbits, etc., for depositing their eggs or young.

a number of birds, insects, animals, etc., inhabiting one such place.

a snug retreat or refuge; resting place; home.

an assemblage of things lying or set close together, as a series of boxes or trays, that fit within each other.

a place where something bad is fostered or flourishes: a robber's nest.

the occupants or frequenters of such a place.

to settle or place (something) in or as if in a nest.

to fit or place one within another.

to build or have a nest.

to settle in or as if in a nest.

to fit together or within another or one another.

to search for or collect nests.

Computers.��to place a routine inside another routine that is at a higher hierarchical level.