1.Definition: a cosy or secluded retreat

Category: Places

2.Definition: a gang of people (criminals or spies or terrorists) assembled in one locality

"A nest of thieves"

Category: General

3.Definition: a kind of gun emplacement

"A machine-gun nest", "A nest of snipers"

Category: Objects

4.Definition: a structure in which animals lay eggs or give birth to their young

Category: Objects

5.Definition: furniture pieces made to fit close together

Category: Objects