What is Lookout ?
Lookout is (noun) 1. a careful watch Keep a sharp lookout for pickpockets. From their lookout post they could see across the square. to be on the lookout for to watch carefully for She’s always on the lookout for bargains. The police are on the lookout for car thieves. 2. a person who is on watch The captain posted a lookout in the bows. 3. something which someone has to deal with that’s his lookout that is something he must deal with himself
source: Easier English, Student Dictionary Upper Intermediate Level