decline

grow worse

go down

“The roof declines here”

inflect for number, gender, case, etc.

“in many languages, speakers decline nouns, pronouns, and adjectives”

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

go down in value

show unwillingness towards

“he declined to join the group on a hike”

refuse to accept

a downward slope or bend

a gradual decrease; as of stored charge or current

grow smaller

change toward something smaller or lower