My integrity has been questioned openly in class (as in, "you made that up"). I hearby respond with a page out of history .. let us put our Humanities education to good use, and consult the works of one Charles Dickens .. in his 1844 novel "The Life and Adventures of Martin Chuzzlewit" (Chapter 27, page 618 in the version indicated below):
Now, if you still don't believe me, go download the novel (Dickens is in the public domain now) here.
Further, the Oxford English Dictionary (the OED, sometimes referred to as the BFD) lists the definition of "look-out" and cites the Dickens work above. Here is the link to the OED reference.
I consider myself vindicated!
The few, the bored, the 32 people that have seen this page.