1 [fal-oh]
(of land) plowed and left unseeded for a season or more; uncultivated.
not in use; inactive: My creative energies have lain fallow this year.
land that has undergone plowing and harrowing and has been left unseeded for one or more growing seasons.
verb (used with object)
to make (land) fallow for agricultural purposes.

1275–1325; Middle English falwe; compare Old English fealga, plural of *fealh, as gloss of Medieval Latin occas harrows

fallowness, noun
unfallowed, adjective
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2 [fal-oh]
pale-yellow; light-brown; dun.

before 1000; Middle English fal(o)we, Old English fealu; cognate with German falb

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fallow1 (ˈfæləʊ)
1.  (of land) left unseeded after being ploughed and harrowed to regain fertility for a crop
2.  (of an idea, state of mind, etc) undeveloped or inactive, but potentially useful
3.  land treated in this way
4.  (tr) to leave (land) unseeded after ploughing and harrowing it
[Old English fealga; related to Greek polos ploughed field]

fallow2 (ˈfæləʊ)
of a light yellowish-brown colour
[Old English fealu; related to Old Norse fölr, Old Saxon, Old High German falo, Latin pallidus Greek polios grey]

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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Word Origin & History

O.E. fealh "fallow land," from P.Gmc. *falgo (cf. O.H.G. felga "harrow," E.Fris. falge "fallow," falgen "to break up ground"), perhaps from a derivation of PIE base *pel- "to turn," assimilated in Eng. to fallow (adj.) because of the color of plowed earth. Originally "plowed land," then "land plowed
but not planted" (1523).

O.E. fealu "pale, faded, dark, yellowish-brown," from P.Gmc. *falwaz (cf. O.N. fölr, M.Du. valu, Ger. falb), from PIE *polwos "dark-colored, gray" (cf. O.C.S. plavu, Lith. palvas "sallow," Gk. polios, Welsh llwyd "gray," L. pallere "to be pale"). It also forms the root of words for "pigeon" in Gk.
(peleia), L. (palumbes), O.Prus. (poalis).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And think of what we'd have to do to an area to grow trees on fallow land where
  there are no trees now.
Because as these banana lands go fallow, you can't grow new bananas in them
  once they're stricken by disease.
The field in the foreground has a wild uncultivated appearance as if it had
  been allowed to remain fallow the preceding summer.
Lost games will mean lost wages as stadiums sit idle and workers lie fallow.
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