Meaning
A pale face with wide eyes, an open mouth and a bluish shading across the forehead, the look of fear creeping in.
It fits scary moments, from ghost stories to a boss saying “we need to talk”. It is also used jokingly for mild dread. It is a step below 😱, which is outright screaming. Pair with 😰. Example: “Teacher just said there’s a pop quiz tomorrow 😨”.