o·ver·bur·den

[v. oh-ver-bur-dn; n. oh-ver-bur-dn]
verb (used with object)
1.
to load with too great a burden; overload: He was overburdened with cares.
noun
2.
an excessive burden.
3.
Also called burden, capping. Mining. waste earth and rock covering a mineral deposit.

Origin:
1570–80; over- + burden1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
overburden
 
vb
1.  (tr) to load with excessive weight, work, etc
 
n
2.  an excessive burden or load
3.  geology the sedimentary rock material that covers coal seams, mineral veins, etc
 
over'burdensome
 
adj

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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00:10
Overburden is one of our favorite verbs.
So is fletcherise. Does it mean:
to chew (food) slowly and thoroughly.
to spend time idly; loaf.
Etymonline
Word Origin & History

overburden
"to put too much weight on," 1532, from over + burden. Earliest uses are figurative.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Where overburden contains more clay, cover-collapse type sinkholes are
  predominant.
Five aquifers exist at this site: one overburden and four bedrock.
Mining produces tremendous amounts of overburden that is laden with heavy
  metals.
Overburden would be blasted and stockpiled or placed directly into the already
  mined pit and coal would be removed.
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