fallow1
Pronunciation: /ˈfaləʊ/
adjective
- 1(of farmland) ploughed and harrowed but left for a period without being sown in order to restore its fertility or to avoid surplus production: incentives for farmers to let land lie fallow
- (of a period of time) characterized by inaction; unproductive: long fallow periods when nothing seems to happen
noun
verb

Origin:
Old English fealgian 'to break up land for sowing', of Germanic origin; related to Low German falgen