Etymology
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overburden (v.)

also over-burden, "to put too much weight on, load with too great a burden," 1530s, from over- + burden (v.). Earliest uses are figurative. Related: Overburdened; overburdening.

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Definitions of overburden
1
overburden (v.)
burden with too much work or responsibility;
overburden (v.)
load with excessive weight;
2
overburden (n.)
the surface soil that must be moved away to get at coal seams and mineral deposits;
overburden (n.)
an excessive burden;
Synonyms: overload
From wordnet.princeton.edu