carpet-crossing
 n.— «During the First Republic when the Northern People’s Congress (NPC), National Council of Nigerian Citizens (NCNC) and the Action Group (AG) were the dominant political parties, indiscipline among politicians took various forms including working against the overall interest of one’s party and dumping it for another after an election. This decampment, was also known as “carpet crossing” while such anti-party activities were usually visited with stiff penalties.» —“Why Indiscipline Thrives in Parties” by Thomas Imonikhe Daily Champion (Lagos, Nigeria) Aug. 16, 2004. (source: Double-Tongued Dictionary)