A bacterial infection in birds, especially poultry, that causes swelling and lameness in the feet, typically from stepping on sharp objects or dirty bedding.
From 'bumble' (to move clumsily) combined with 'foot,' first used in veterinary contexts in the late 19th century to describe the awkward gait caused by the infection.
Medieval farmers noticed their chickens developing this condition and named it after the characteristic stumbling walk—it's actually a real veterinary diagnosis today that chicken keepers still worry about!
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