<p><strong>Noun</strong></p><ul><li>Also called black quarter.</li><li>Veterinary Pathology: an infectious, often fatal disease of cattle and sheep, caused by the soil bacterium <em>Clostridium chauvoei</em> and characterized by painful, gaseous swellings in the muscles, usually of the upper parts of the legs.</li><li>Plant Pathology: a disease of cabbage and other cruciferous plants, characterized by dry, black lesions on the base of the stem, caused by a fungus, <em>Phoma lingam</em>.</li><li>A disease of potatoes, characterized by wet, black lesions on the base of the stem, caused by a bacterium, <em>Erwinia atroseptica</em>.</li><li>A swindler, especially in racing or gambling.</li><li>British Informal: a strikebreaker; scab.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) British Informal: to replace (a worker) who is on strike.</li><li>To refuse to support (a union, union workers, or a strike).</li><li>To betray or deceive (a person or cause).</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) British Informal: to return to work before a strike is settled.</li></ul>