This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The act of being a tenant farmer, especially in the southern United States, who farms the land in exchange for a portion of the crops.

v. Present participle of sharecrop.

"For centuries large areas of central Italian countryside, including much of Tuscany, were characterized by sharecropping, the contractual system in which the landowner split the fruits of agriculture equally with his peasant tenants."

sharecropped    sharecropping    sharecrops