decline (declines plural & 3rd person present) (declining present participle) (declined past tense & past participle )
1 verb If something declines, it becomes less in quantity, importance, or strength.
The number of staff has declined from 217,000 to 114,000... V from/to/by amount
2 verb If you decline something or decline to do something, you politely refuse to accept it or do it.
FORMAL He declined their invitation... V n
3 n-var If there is a decline in something, it becomes less in quantity, importance, or quality.
There wasn't such a big decline in enrollments after all...
4 If something is in decline or on the decline, it is gradually decreasing in importance, quality, or power.
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in decline/on the decline phrase
Thankfully the smoking of cigarettes is on the decline...
5 If something goes or falls into decline, it begins to gradually decrease in importance, quality, or power.
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into decline phrase
Libraries are an investment for the future and they should not be allowed to fall into decline.