Etymology
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watchman (n.)

also watch-man, c. 1400, "guard, sentinel, lookout" (late 12c. as a surname), figuratively "guardian, protector" (mid-15c.), from watch (n.) + man (n.). Also "person characterized by wakefulness" (mid-15c.).

updated on June 02, 2012

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Definitions of watchman from WordNet

watchman (n.)
a guard who keeps watch;
Synonyms: watcher / security guard
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.