an observation tower for a lookout to watch over prisoners or watch for fires or enemies
A tower in which a sentinel is placed to watch for enemies, the approach of danger, or the like
A watchtower is a high building which gives a person a good view of the area around the place that they are guarding. a magazine produced by the religious group the Jehovah's Witnesses, who go to people's houses and try to persuade them to buy it. a high tower used for watching and guarding a place