(dĭ-klīn′)/Verb: 1. To express polite refusal: I wanted to invitethem but I was afraid they would decline.2.'a. To slope downward; descend: The roofdeclines at a steep angle.b. To bend downward; droop: boughsdeclining toward the ground.3. To degrade or lower oneself; stoop: refused todecline to their level of behavior.4. To deteriorate gradually; fail: His health has been declining for years.5.'a. To sink, as the setting sun.b. To draw to a gradual close: We made our way home as the day declined.v.'tr.1. To refuse politely: I declined their offer ofhelp. See Synonyms at refuse1.2. To cause to slope or bend downward.3. Grammar To inflect (a noun, a pronoun, or anadjective) for number and case.n.1. The process or result of declining, especially:a. A gradual deterioration, as in numbers,activity, or quality: "overwhelmingevidence that fish stocks ... are indecline" (Jonathan Bocknek).b. A downward movement or fall, as inprice.c. A deterioration of health: the patient'srapid decline.2. A downward slope; a declivity: the sharpdecline of the dunes to the sea.