Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
The expression, "Break up your fallow ground" (Hos. 10:12; Jer. 4:3
) means, "Do not sow your seed among thorns", i.e., break off all your evil habits; clear your hearts of weeds, in order that they may be prepared for the seed of righteousness. Land was allowed to lie fallow that it might become more fruitful; but when in this condition, it soon became overgrown with thorns and weeds. The cultivator of the soil was careful to "break up" his fallow ground, i.e., to clear the field of weeds, before sowing seed in it. So says the prophet, "Break off your evil ways, repent of your sins, cease to do evil, and then the good seed of the word will have room to grow and bear fruit."
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.