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1. Grow worse
   "Conditions in the slum declined";
   - worsen
    
2. Not accept
   "He declined my offer of hospitality";
   - refuse, reject, pass up, turn down
    
3. Show unwillingness towards
   "he declined to join the group on a hike";
   - refuse
    
4. Grow smaller
   "Interest in the project declined";
   - go down, wane
    
5. Go down
   "The roof declines here"
    
6. Go down in value
   "prices declined";
   - slump, correct
    
7. Inflect for number, gender, case, etc.
   "in many languages, speakers decline nouns, pronouns, and adjectives"

1. Change toward something smaller or lower
   - diminution
    
2. A condition inferior to an earlier condition; a gradual falling off from a better state
   - declination
    
3. A gradual decrease; as of stored charge or current
   - decay
    
4. A downward slope or bend
   - descent, declivity, fall, declination, declension, downslope

Derived forms: declined, declining, declines

Type of: change state, come down, condition, decrease, decrement, descend, diminish, drop, fall, go down, incline, inflect, lessen, react, reply, respond, side, slope, status, turn

Antonym: improvement

Encyclopedia: Decline