nest

move or arrange oneself in a comfortable and cozy position

a cosy or secluded retreat

a gang of people (criminals or spies or terrorists) assembled in one locality

“a nest of thieves”

a kind of gun emplacement

“a machine-gun nest”

a structure in which animals lay eggs or give birth to their young

fit together or fit inside

“nested bowls”

furniture pieces made to fit close together

gather nests

inhabit a nest, usually after building

“birds are nesting outside my window every Spring”