Ma’anar ƙamus na “tushen ƙafar ƙafa” babbar dabara ce da aka ɗora ginshiƙai ko ruwan wukake kewaye da kewayenta, ana amfani da ita wajen motsa jirgin ruwa ko jirgi ta ruwa ta hanyar jujjuya ƙafafun. Jujjuyawar dabarar ta ture ruwa a bayan jirgin, yana haifar da motsi gaba. An yi amfani da ƙafafun filafilai a farkon jiragen ruwa masu ƙarfin tururi da kwale-kwalen kogi.
