From Longman Dictionary of Contemporary Englishnight watchmanˌnight ˈwatchman noun [countable] BOPROTECTsomeone whose job is to guard a building at night —night watch noun [uncountable]
Examples from the Corpus
night watchman• Her husband was recently laid off from his construction job and is now employed part-time as a night watchman.• The secretary lost Awlad Amira support and became a night watchman in a school.• Being a night watchman had its compensations, he had to admit.• Thus the state should be mainly a night watchman, a low-profile policeman who ensures the basic safety of every individual.• I liked the night air but the night watchman didn't like the open window.• Clyde, the night watchman, stood to attention as they alighted.• At first, the night watchman thought it was an avalanche.• The spooky goings-on happened when night watchman James Durham spotted a man with a heavy overcoat walking his black retriever. 