a place where a wild animal lives:the badgers carried the food back to their lair
a secret or private place in which a person seeks concealment or seclusion:he led the police to the criminals' lair
Origin:
Old Englishleger 'resting place, bed', of Germanic origin; related to Dutch leger 'bed, camp' and German Lager 'storehouse', also to lie1. Compare with laager, lager, and leaguer2