What is the meaning of Fallow?

Ground ploughed and harrowed but left unseeded for one year.

Uncultivated land.

The ploughing or tilling of land, without sowing it for a season.

Ploughed but left unseeded for more than one planting season.

Left unworked and uncropped for some amount of time.

Inactive; undeveloped.

To make land fallow for agricultural purposes.

Of a pale red or yellow, light brown; dun.

Source: wiktionary.org