כחשא

כַּחֲשָׁאm. (preced.) reduction, deterioration. B. Kam.59a כַּחַש גופנא the weakening of the vine (by allowing the grapes to remain on it until they are ripe). B. Mets. 101b משום כ׳ דארעא because he exhausted the soil by planting trees. Ib. 104b מנכי ליה כ׳ דארעא he must allow him a reduction of his rent in consideration of the leaser exhaustion of the soil (by having planted wheat in place of poppy).