Decline/dɪˈklaɪn/ Definition 1 of 4Pro Tip 1/3Slow Change Often implies a slow or gradual process, not sudden. The quality of the show declined over the seasons. Pro Tip 2/3Negative Progression Used to talk about something becoming less positive or desirable. Attendance at the meetings has been declining. Pro Tip 3/3Business Context Commonly used in business or economics to describe downward trends. Profits declined by 15% last quarter.