"fallow" in the noun sense
1. fallow
cultivated land that is not seeded for one or more growing seasons
"fallow" in the adjective sense
1. fallow
left unplowed and unseeded during a growing season
"fallow farmland"
2. fallow
undeveloped but potentially useful
"a fallow gold market"
Source: WordNet® (An amazing lexical database of English)
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