These verbs mean to become smaller or less or to cause something to become smaller or less. Decrease commonly implies a sustained reduction in stages, especially of bulk, size, volume, or quantity, often from some imperceptible cause or inherent process: The swelling decreased daily. The meaning of DECREASE is to become smaller in size, amount, number, or intensity. How to use decrease in a sentence. Synonym Discussion of Decrease. decreased adjective [ before noun ] uk/dɪˈkriːst/us having become less: decreased costs / sales / spending (Definition of decreased from the Cambridge Business English Dictionary © Cambridge University Press) DECREASED definition: past participle of decrease. and past tense form of decrease. See examples of decreased used in a sentence. Find 522 synonyms for decreased and other similar words that you can use instead based on 6 separate contexts from our thesaurus. Synonyms for DECREASED: dropped, depressed, under, receded, knockdown, low, down, reduced; Antonyms of DECREASED: increased, high, elevated, up, heightened, raised, maximum, extreme Find 181 different ways to say DECREASED, along with antonyms, related words, and example sentences at Thesaurus.com. Our share of the market has decreased sharply this year. We have decreased our involvement in children's books. decreased Add to list Definitions of decreased adjective made less in size or amount or degree synonyms: reduced.