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Webster 1913 Edition

Verb.

To plow and work in summer, in order to prepare for wheat or other crop; to plow and let lie fallow.

Noun.

[See Fallow.] Naked fallow; land lying bare of crops in summer.

Verb.

To plow and work repeatedly in summer, to prepare for wheat or other crop.

See also: summer fallow

summer-fallow ‎(third-person singular simple present summer-fallows, present participle summer-fallowing, simple past and past participle summer-fallowed)

To plough and work in summer, in order to prepare for wheat or other crop; to plough and let lie fallow.