declineとは何ですか?To express polite refusal.To slope downward; descend.To bend downward; droop.To degrade or lower oneself; condescend.To deteriorate gradually; fail.To sink, as the setting sun.To draw to a gradual close; wane.To refuse politely: I declined their offer of help. See Synonyms at refuse1.To cause to slope or bend downward.Grammar To inflect (a noun, a pronoun, or an adjective) for number and case.The process or result of declining, especially a gradual deterioration.A downward movement.The period when something approaches an end.A downward slope; a declivity.A disease that gradually weakens or wastes the body.