decline (of something)a continuous decrease in the number, value, quality, etc. of somethinga rapid/sharp/gradual declineurban/economic declineThe company reported a small decline in its profits.An increase in cars on the roads has resulted in the decline of public transport.The town fell into (a) decline(= started to be less busy, important, etc.) after the mine closed.The steel industry in the United States has been in decline since the 1970s.