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pin-fallow

ˈpin-ˌfallow, n. Agric.
  [f. (?) pin n. + fallow n.]
  ‘Winter-fallow; a fallow in which no crop is lost’ (Eng. Dial. Dict.). Hence pin-fallow v., to winter-fallow: see quots.

1668 R. Holme Armoury iii. 334/1 Pin Fallow is a Plowing twice for Peas, first in Christmas, then in March. 1790 W. Marshall Midl. Counties (1796) I. 191 Pin fallow..the origin of this term I have not learnt; it appears to be synonymous with winter fallow or barley fallow. 1794 Billingsley Agric. Survey Som. 159 Pin fallow..ploughing after vetches, clover, or beans, two or three times, to prepare for a succeeding crop of wheat. 1881 Leicestersh. Gloss. s.v., When lea-land is fallowed about July or August, ready to be ploughed again for the crop, it is said to be pin-fallowed.

Oxford English Dictionary

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