to decline /dɪˈklaɪn/ /dɪˈklaɪn/
to deteriorate /dɪˈtɪriəˌreɪt/ /dɪˈtɪərɪəreɪt/
to fall /fɔːl/ /fɔːl/
to drop /drɑːp/ /drɒp/