watchtower
🇺🇸
/ˈwɑːtʃtaʊər/
🇬🇧
/ˈwɒtʃtaʊə(r)/
A tall structure that people use to keep an eye on a certain area, usually for safety or security reasons.
From the watchtower, the guards could see anyone approaching the castle.
瞭望塔から、警備員は城に近づく人を見ることができます。