The quality of our products has decreased since the main designer left.
verb To make (a quantity) smaller.
Let's decrease the volume a little so we can hear each other talking.
noun An amount by which a quantity decreases or is decreased.
After six years of constant growth, the company reported a slight decrease in sales last year.
noun A reduction in the number of stitches, usually accomplished by suspending the stitch to be decreased from another existing stitch or by knitting it together with another stitch. See Decrease (knitting).