Definition of "Decline" :
noun: a downward slope or bend
noun: a gradual decrease; as of stored charge or current
noun: change toward something smaller or lower
noun: a condition inferior to an earlier condition; a gradual falling off from a better state
verb: grow worse
verb: grow smaller
verb: show unwillingness towards
"He declined to join the group on a hike."
verb: inflect for number, gender, case, etc.
"In many languages, speakers decline nouns, pronouns, and adjectives."
verb: go down in value
verb: go down
"The roof declines here."
verb: refuse to accept