1. refused politely to accept or do something
Usage: past tense of decline
2. became smaller, fewer, or less; deteriorated
Usage: past tense of decline

Examples

• She declined the invitation to the party.
• He declined to comment on the situation.
• The company’s profits declined last quarter.
• His health has declined rapidly this year.
• The population of the town declined over the decades.
• They politely declined our offer of help.
• Sales declined during the economic downturn.