1. tall structures used for observation and surveillance, typically for military or security purposes

Examples

• The prison was surrounded by several watchtowers.
• Guards in the watchtowers monitored the border crossing.
• Ancient watchtowers were built along the Great Wall of China.
• The military base had watchtowers positioned at each corner.
• Soldiers kept watch from the stone watchtowers throughout the night.
• The medieval castle featured tall watchtowers for defense.
• Border patrol agents used watchtowers to spot illegal crossings.