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1. Becoming less or smaller
    
2. Music

1. Become smaller or less in size, extent, or range
   "The amount of homework decreased towards the end of the semester"
   - diminish, lessen, fall
    
2. Make smaller
   "He decreased his staff"
   - lessen, minify

See also: allargando, calando, decrescendo, depreciating, depreciative, depreciatory, detractive, diminishing, diminuendo, dwindling, falling, rallentando, rit., ritardando, ritenuto, tapering, tapering off

Type of: alter, change, change magnitude, modify

Antonym: increase, increasing

Encyclopedia: Decrease