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Webster 1913 Edition

Adj.

Overstocked, or overgrown, or covered, with grass.

[Obs.]

Spenser.

pp.

Overstocked with grass; overgrown with grass.

overgrassed ‎(comparative more overgrassed, superlative most overgrassed)

(obsolete) Overstocked, or overgrown, or covered, with grass.
(Can we find and add a quotation of Spenser to this entry?)