Our share of the market has decreased sharply this year. We have decreased our involvement in children's books. These verbs mean to become smaller or less or to cause something to become smaller or less. decreased Add to list Definitions of decreased adjective made less in size or amount or degree synonyms: reduced DECREASED definition: to diminish or cause to diminish in size , number, strength , etc | Meaning, pronunciation, translations and examples 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. 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. Find 181 different ways to say DECREASED, along with antonyms, related words, and example sentences at Thesaurus.com. 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. Synonyms for DECREASED: dropped, depressed, under, receded, knockdown, low, down, reduced; Antonyms of DECREASED: increased, high, elevated, up, heightened, raised, maximum, extreme.