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Longman Dictionary of Contemporary English
night watchman
noun
EXAMPLES FROM CORPUS
▪ At first, the night watchman thought it was an avalanche.
▪ Being a night watchman had its compensations, he had to admit.
▪ Clyde, the night watchman, stood to attention as they alighted.
▪ Her husband was recently laid off from his construction job and is now employed part-time as a night watchman.
▪ I liked the night air but the night watchman didn't like the open window.
▪ The secretary lost Awlad Amira support and became a night watchman in a school.
▪ The spooky goings-on happened when night watchman James Durham spotted a man with a heavy overcoat walking his black retriever.
▪ Thus the state should be mainly a night watchman, a low-profile policeman who ensures the basic safety of every individual.
Wiktionary
night watchman

alt. 1 (context obsolete English) Prior to police forces, a person appointed by a town or city to walk the streets at night and guard the burghers from felons and robbers. 2 A person who guards (usually at a building) at night. 3 (context cricket English) The last batsman in a three or five day game to play on a particular day and thus carry over the batting to the following day. n. 1 (context obsolete English) Prior to police forces, a person appointed by a town or city to walk the streets at night and guard the burghers from felons and robbers. 2 A person who guards (usually at a building) at night. 3 (context cricket English) The last batsman in a three or five day game to play on a particular day and thus carry over the batting to the following day.

WordNet
night watchman

n. a watchman who works during the night

Usage examples of "night watchman".

But he knew the night watchman was bent over his magazines in another part of the building.

This can be accomplished by posing as a repairman, bribing a custodian or night watchman, or (in the worst case) breaking and entering.

The night watchman was a friendly, talkative old man who reminded me a little of Christiansen.

He's a guard, and he's on duty from five in the afternoon until the regular night watchman comes on.

They had the numbers, so they wouldn't wait for darkness if they could help it, they'd have an easier job smoking him out in daylight, and it would be cleaner to do it and get it over with before the night watchman showed up.

For Perrin, too, had the look of Smiling Tony, of Simon Stevens, of Henry Hawkins, the night watchman.

But Frank had an idea which he urgently wanted to check out with Mike, the night watchman at the Haley Building.