verb

• (transitive) To lie in wait for and attack from ambush.
  "Oh, youthful benefactress! how often in succeeding years, standing in solitary places, and thinking of thee with grief of heart and perfect love—how often have I wished that, as in ancient times, the curse of a father was believed to have a supernatural power, and to pursue its object with a fatal necessity of self-fulfilment; even so the benediction of a heart oppressed with gratitude might have a like prerogative, might have power given to it from above to chase, to haunt, to waylay, to overtake, to pursue thee into the central darkness of a London brothel, or (if it were possible) into the darkness of the grave, there to awaken thee with an authentic message of peace and forgiveness, and of final reconciliation!"
• (transitive) To accost or intercept unexpectedly.
  "And when some of the friends, the ones who came every day, waylaid the doctor in the corridor, Stephen was the one who asked the most informed questions, who’d been keeping up not just with the stories that appeared several times a week in the Times […]"