Etymology From increase + -ing (participial suffix).
1
On the increase.
steadily increasing demand
The world’s environmental crises are an increasing concern in international politics. Deforestation of the Amazon was high on the agenda of this week’s G7 meeting in Biarritz, France. In September, world leaders will gather in New York for a climate action summit.2019 August 30, Jonathan Watts, “Amazon fires show world heading for point of no return, says UN”, in The Guardian:
Now begin the increasings for the chest by making 2 stitches in the fourth stitch; repeat this, increasing in every fourth row, but 1 stitch further each time, so as to form a slanting line, the same as a dress-pleat.1864, The Ladies' Companion and Monthly Magazine, page 277: