Watchman/ˈwɑːtʃmən/ Definition 1 of 2Pro Tip 1/3Professional Role Refers to someone employed to ensure safety and prevent unauthorized access. The building's watchman checks IDs at the entrance. Pro Tip 2/3Nighttime Security Often used to describe guards working during overnight shifts. The night watchman patrols the premises until dawn. Pro Tip 3/3Vigilance Required A watchman is expected to be consistently alert and attentive. A watchman's attention never wavers during their shift.