A careful looking or watching for any object or event.
A person engaged in watching; a sentinel; a sentry.
A person designated to watch for other vessels and hazards.
a person employed to watch for something to happen
Someone posted to keep watch on the horizon for other ships or signs of land. i.e. â€œYer lookout better be hollerinâ€(tm) if he sees any signs of Murphyâ€(tm)s ship.
A lookout or look-out is a person on a ship in charge of the observation of the sea for hazards, other ships, land, etc. One of the more famous historical lookouts was Paul Revere.