Real Dictionary

fallow
A fallow period is a time when very little is being achieved.
adjective: Fallow land has been dug or ploughed but nothing has been planted in it, especially so that its quality or strength has a chance to improve.

fallow in American English 1
land plowed but not seeded for one or more growing seasons, to kill weeds, make the soil richer, etc.
left uncultivated or unplanted
adjective: plowed and left unseeded for a season or more; uncultivated
noun: land that has undergone plowing and harrowing and has been left unseeded for one or more growing seasons
transitive verb: to make (land) fallow for agricultural purposes

fallow in American English 2
pale-yellow; brownish-yellow
adjective: pale-yellow; light-brown; dun

fallow in British English 1
adjective: (of land) left unseeded after being ploughed and harrowed to regain fertility for a crop
noun: land treated in this way
verb: to leave (land) unseeded after ploughing and harrowing it

fallow in British English 2
adjective: of a light yellowish-brown colour