An amount by which a quantity is decreased.

“One research team has recorded Baishui’s decrease at about 27 meters per year over the last 10 years.”

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).

Of a quantity, to become smaller.

To make (a quantity) smaller.