Definitions of nest:

• noun:   a kind of gun emplacement

  Example: "A machine-gun nest"

• noun:   furniture pieces made to fit close together
• noun:   a gang of people (criminals or spies or terrorists) assembled in one locality

  Example: "A nest of thieves"

• noun:   a cosy or secluded retreat
• noun:   a structure in which animals lay eggs or give birth to their young
• verb:   inhabit a nest, usually after building

  Example: "Birds are nesting outside my window every Spring"

• verb:   gather nests
• verb:   fit together or fit inside

  Example: "Nested bowls"

• verb:   move or arrange oneself in a comfortable and cozy position
• name:  A surname (very rare: popularity rank in the U.S.: #26223)