verb (used with object)
to explain, worry about, or work at (something) repeatedly or more than is necessary: He kept belaboring the point long after we had agreed.
to assail persistently, as with scorn or ridicule: a book that belabors the provincialism of his contemporaries.
to beat vigorously; ply with heavy blows.
Obsolete. to labor at.
Also, especially British, belabour.

1590–1600; be- + labor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
belabour or (US) belabor (bɪˈleɪbə)
1.  to beat severely; thrash
2.  to attack verbally; criticize harshly
3.  an obsolete word for labour
belabor or (US) belabor

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

c.1600, "to exert one's strength upon," from be- + labor. But figurative sense of "assail with words" is attested somewhat earlier (1590s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's important to shine a light on lobbying, more than to belabor this
  inevitable calling.
There is no need to belabor the wobbly nature of this third term.
However, if it is impossible to praise these stories, it would be surly to
  belabor them.
Well constructed as these stories are, some may seem to belabor their themes
  with built-in explanations.
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