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de‧cline1 W2
[singular, uncountable]
[singular, uncountable] steady/gradual/long-term decline
The island's population initially numbered 180, but there was a gradual decline until only 40 people were left.
The island's population initially numbered 180, but there was a gradual decline until only 40 people were left. fall/go etc into decline
The port fell into decline (=became less important and less busy) in the 1950s.
The port fell into decline (=became less important and less busy) in the 1950s.