Lookout /(?)/

Look·out

Lookout

n.
  1. A careful looking or watching for any object or event.
  2. The place from which such observation is made.
  3. A person engaged in watching; a sentinel; a sentry.
  4. Object or duty of forethought and care; responsibility. [Colloq.]

Phrases & Compounds
on the lookout for
in search of; looking for.