Definition of lookouts:
(n) :
A person on watch for approaching enemy, police, danger, etc.
(n) :
A session of watching for an approaching enemy, police, etc.
(n) :
A vantage point with a view of the surrounding area.
(n) :
One's perspective, outlook; hence, one's responsibility. (used with a possessive pronoun or a noun in a possessive form).
(n) :
A subject for observation; a prospect or view.
(n) :
An observation window.