Definition of "decrease"

(intransitive) Of a quantity, to become smaller.  examples

(transitive) To make (a quantity) smaller.  examples

An amount by which a quantity decreases or is decreased.  examples

(knitting) 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).  examples