Ƙarƙashin abin nadi yana nufin sashin da ke cikin naúrar fuser wanda ke yin haɗin gwiwa tare da abin nadi na fuser na sama don yin matsa lamba ga kafofin watsa labaru na fuser don tabbatar da cewa narkewar gari ya shiga cikin takarda, don haka ya sami sakamako mai gyarawa.