<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 (used with object)</strong></p><ul><li>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 (used without object)</strong></p><ul><li>British Informal: to return to work before a strike is settled.</li></ul>