Imbumbu (kumbe igolo) ligama elitsho isitho sensitha sabesifazane, esitholakala phakathi kewmilenze nxa owesifazane examalazile. Isitho lesi silemisebenzi embalwa, egoqela ukuchama, ukubeletha kanye lokwamukela isitho sowesilisa (ubolo) nxa kuzekwana (emacansini).