Definition of priest hole in English:

priest hole

noun

(also priest's hole)
historical
  • A hiding place for a Roman Catholic priest during times of religious persecution.

    ‘A tour round some of the hidden parts of Towneley Hall, including priest's holes, the cellars and the attic, is also on the agenda.’
    • ‘Catherine appointed the Benedictine Father Huddleston, who had hidden Charles II in his priest's hole after the Battle of Worcester in 1651.’