We found one dictionary that defines the word decreasers:

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1. decreasers: Wiktionary

Opposite: increasers, growers, expanders ▸ Words similar to decreasers ▸ Usage examples for decreasers ▸ Idioms related to decreasers ▸ Wikipedia articles (New!) ▸ Words that often appear near decreasers ▸ Rhymes of decreasers ▸ Invented words related to decreasers