• WordNet 3.6
    • v understock stock with less than the usual or desirable number or quantity
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Webster's Revised Unabridged Dictionary
    • v. t Understock To supply insufficiently with stock.
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Century Dictionary and Cyclopedia
    • understock To supply insufficiently with stock; put too small a stock in or on: said generally of a farm.
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Chambers's Twentieth Century Dictionary
    • v.t Understock un-dėr-stok′ to supply with an insufficient amount of stock.
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In literature:

Every acre had been "taken up," but as yet the runs were rather understocked.
"Station Amusements" by Lady Barker
However, the best understocks are those produced from seeds of native grown trees.
"Growing Nuts in the North" by Carl Weschcke
Here it is: Rhodes, Wright and Fodermaier heartnuts patch-budded on 10 Japanese understocks (all I had) took 100%.
"Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting" by Northern Nut Growers Association
The market is here understocked with labour.
"An Inquiry Into the Nature and Causes of the Wealth of Nations" by Adam Smith