a place for watching from, especially for danger or an enemy coming towards you 监视处；观察所；瞭望台 a lookout point/tower 瞭望哨；瞭望塔
a person who has the responsibility of watching for something, especially danger, etc. 监视员；观察员；瞭望员
Idioms
be somebody’s lookout
be on the lookout (for somebody/something) | keep a lookout (for somebody/something)
- (informal)
to watch carefully for somebody/something in order to avoid danger, etc. or in order to find something you want 注意；警戒；留心 The public should be on the lookout for symptoms of the disease. 公众应当留心这种疾病的症状。 The guards have to keep a sharp lookout for anything suspicious. 警卫必须密切注意任何可疑的东西。