The phrase "natural flush" means a reddish or rosy color that appears on someone's face and is not caused by makeup but instead by a natural reaction or emotion. Full definition
It is more of a terra cotta hue that gives me such a healthy & incredibly natural flush of color! (100percentpure.com)
The mixed pinks of N.Y.C. New York Color Color Wheel Mosaic Blush Powder in Plum Passion (drugstores) create an incredibly natural flush on cheeks, and the oversize pan makes brush swirling easier. (health.com)
I find myself being able to wear them with so many different looks because they lean more towards to natural flush look which every girl needs a blush in her wardrobe that does that, I just happen to have three. (inaworldofbees.com)