watch·man
noun/ˈwɒtʃmən/
/ˈwɑːtʃmən/
(plural watchmen
(old-fashioned)/ˈwɒtʃmən/
/ˈwɑːtʃmən/
)- a man whose job is to guard a building, for example a bank, an office building or a factory, especially at night
（夜间）保安员，看守人，警卫员