Adj.

Definition: plowed and left unseeded for a season or more; uncultivated

Ex. The farmer left the plot of land fallow to give the soil a chance to recover.

Adj.

Definition: not in use; inactive

Ex. I had to leave the blog fallow, due to concerns in my personal life.

Verb

Definition: to make (land) fallow for agricultural purposes

Ex. The hired hands fallowed the field before the weather got too cold.