Definition of fallow-deer:
(n) :
(agriculture, uncountable) Ground ploughed and harrowed but left unseeded for one year.
(adj) :
(of agricultural land) Ploughed but left unseeded for more than one planting season.
(adj) :
(of agricultural land) Left unworked and uncropped for some amount of time.
(n) :
(agriculture, uncountable) Uncultivated land.
(n) :
The ploughing or tilling of land, without sowing it for a season.
(adj) :
(figurative) Inactive; undeveloped.