Bushing

n. १ (a usu. removable lining or sleeve of metal or other material that is inserted or screwed into an opening to limit its size, resist wear or erosion, etc.) अस्तर (नलिका वगैरे) २ Elec. Eng. (as, an insulating sleeve inserted in an opening in a metal plate or case to protect a through conductor from abrasion and possible short-circuit) अस्तरण (न.), बुशिंग (न.)