A man who is employed to stand guard or keep watch.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "watchman" in a sentence
"When a watchman is absent, or remiss, or bribed, the stream is turned out of its course, and every one helps himself or fills his cistern."
"One of the most important functions of the watchman is to be seen from the street with my evil looking dog."
"Approaching the garden wing, he called the watchman twice."