How to Say "night watchman" in Spanish
The Spanish word for “night watchman” is “sereno” — C1 level.
English → SpanishC1
nounC1formal
A traditional job of patrolling streets at night

Examples
Antiguamente, el sereno vigilaba las calles y daba la hora.
In the old days, the night watchman guarded the streets and announced the time.
Historical Context
This word is rarely used for modern security guards (who are called 'guardias' or 'vigilantes'). It specifically refers to the old-fashioned street watchman.
Related Translations
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