nighthawking - definition and synonyms

noun [uncountable]
  1.   From our crowdsourced Open Dictionary
    the illegal activity, usually at night, of using metal detectors to look for very old and valuable objects in areas where you do not have permission to search, and of stealing any objects that you find

    Illegal metal detecting - or "nighthawking" as it is more commonly known - is sweeping the spine of the east of England, heritage groups say.

    Submitted by Kerry from United Kingdom on 14/08/2015