disincrease noun 1verb 1forms 3 noun1 •(rare) The reduction of something that has increased or that typically increases.It takes brisk, frosty weather for this lest the meat should spoil before being salted down and put away; and the darkies say it is bad luck to kill hogs except in “the disincrease" of the moon. — 1902 verb1 •(rare) To diminish; to decrease in size or number.My people have been so unhappy for a long time they wish now to disincrease, instead of multiply. — 1883 formsdisincreased · disincreasing · disincreases