the act of looking out or keeping watch.
a watch kept, as for something that may happen.
a person or group keeping a watch.
a station or place from which a watch is kept.
an object of care or concern: That's not my lookout.
tailpiece ( def 4 ).
Chiefly British. view; prospect; outlook: The business lookout is far from optimistic.

1690–1700; noun use of verb phrase look out

3. sentinel, sentry, patrol, guard.
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a sandy reef in the Outer Banks, off E North Carolina, SW of Cape Hatteras: lighthouse.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lookout (ˈlʊkˌaʊt)
1.  the act of keeping watch against danger, etc
2.  a person or persons instructed or employed to keep such a watch, esp on a ship
3.  a strategic point from which a watch is kept
4.  informal worry or concern: that's his lookout
5.  chiefly (Brit) outlook, chances, or view
vb (foll by on or over)
6.  to heed one's behaviour; be careful: look out for the children's health
7.  to be on the watch: look out for my mother at the station
8.  (tr) to search for and find: I'll look out some curtains for your new house
9.  to face in a particular direction: the house looks out over the moor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also look-out, "person who stands watch or acts as a scout," 1690s, from look + out.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see keep an eye out for (sharp lookout); on the lookout. Also see entries beginning with look out.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
And, be on the lookout for a large selection of home and garden goods that have
  appeared in the magazine.
Be on the lookout for elk and coyote trotting through.
While in groups, animals from birds to mongooses employ a lookout that makes a
  sound every few seconds to signal that all's well.
Editors on the lookout for manuscripts become fixtures at academic conferences,
  and monitor the voices behind conference papers.
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