A falling off; a tendency to a worse state; diminution or decay; deterioration; also, the period when a thing is tending toward extinction or a less perfect state; as, the decline of life; the decline of strength; the decline of virtue and religion.(noun)
inflect for number, gender, case, etc.,(verb.communication)
Example: In many languages, speakers decline nouns, pronouns, and adjectives.
source: wordnet30
To bend, or lean downward; to take a downward direction; to bend over or hang down, as from weakness, weariness, despondency, etc.; to condescend.(verb)
source: webster1913
To bend downward; to bring down; to depress; to cause to bend, or fall.(verb)