Blending is working two colours together so no edge shows. Blending eyeshadow, careful blending, blending brush.
It is the single skill that separates competent makeup from obvious makeup, and it is mostly about small circular motions and a clean brush. Blending also names mixing anything into a smooth whole — blending tea, blending whisky, blending families. Note blend; and that the Old English verb meant to mix and is unrelated to blind.
1nounblendingWorking two colours together so no edge shows.
“The artist used her fingers for blending, so the blue sky faded softly into the pink sunset.”
blending is a mixing.
Blend plus -ing, from Middle English blenden, to mix, probably from Old Norse blanda. It is not related to blind.
Middle English
blendinge
English, today
blending
From Middle English blendinge, equivalent to blend + -ing.
Etymology from Wiktionary, CC BY-SA