Longman Dictionary English From Longman Business DictionaryRelated topics: Financedeclinerde‧clin‧er /dɪˈklaɪnə-ər/ noun [countable usually plural] FINANCE a share that falls in value on a particular day of trading on a stockmarketSYNDECLINING SHAREsDotcom shares were the exchange’s biggest decliner of the session. ldoceonline.com