nest

Move or arrange oneself in a comfortable and cozy position.

Fit together or fit inside.

“nested bowls”

Gather nests.

Inhabit a nest, usually after building.

“birds are nesting outside my window every Spring”

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 nest of snipers”

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

Furniture pieces made to fit close together.