means A structure built by a bird (or other animal) to hold its eggs and young, or by extension any cozy, snug, or sheltering place where something settles in.

from From Old English 'nest,' from a Proto-Germanic root that gives German 'Nest' as well. Trace it back further and you reach the Proto-Indo-European pieces *ni- 'down' and *sed- 'sit' — literally 'the place where you sit down.' So a nest is, etymologically, just the spot where you settle yourself, which is exactly what a bird does with twigs and what you do with a couch on a Sunday. Related, fittingly, to 'sit' and 'settle.'