From Longman Dictionary of Contemporary Englishlairlair /leə $ ler/ noun [countable] 1 HBAHOMEthe place where a wild animal hides and sleeps SYN den2 HIDE/MAKE IT HARD TO FIND OR SEEa place where you go to hide or to be alone SYN den a smuggler’s lair
Examples from the Corpus
lair• the smugglers' lairOrigin lair Old English leger “act of lying, bed” 