noun

• (figuratively) A place inhabited by a criminal or criminals, a superhero or a supervillain; a refuge, retreat, haven or hideaway.
  "...Van Helsing stood up and said, "Now, my dear friends, we go forth to our terrible enterprise. Are we all armed, as we were on that night when first we visited our enemy's lair. Armed against ghostly as well as carnal attack?""
• (British dialectal) A bed or resting place.
  "Then would I in Plenty's lap, For the first time take a nap; Falling back in easy lair, Sweetly slumb'ring in my chair;"
• (Scotland) A grave; a cemetery plot.
  "[…] but few knew the reason, and some thought it was because the deceased were strangers, and had no regular lair. I dressed the two bonny orphans in the best mourning at my own cost […]"
• (seduction community) A group where pickup artists meet to discuss and practise seduction techniques.

verb

• (British) To rest; to dwell.
  "The lee-light that December gies Was lairing in the wast, Whan Christy wi' her oa claes, Was boun' to dree the blast."
• (British) To lay down.
• (British) To bury.

noun

• (Scotland) A bog; a mire.

verb

• (transitive, Scotland) To mire.
• (intransitive, Scotland) To become mired.