decline

change toward something smaller or lower

a condition inferior to an earlier condition; a gradual falling off from a better state

a gradual decrease; as of stored charge or current

a downward slope or bend

grow worse; "Conditions in the slum worsened"

refuse to accept; "He refused my offer of hospitality"

show unwillingness towards; "he declined to join the group on a hike"

grow smaller; "Interest in the project waned"

go down; "The roof declines here"

go down in value; "the stock market corrected"; "prices slumped"

inflect for number, gender, case, etc., "in many languages, speakers decline nouns, pronouns, and adjectives"