bangs pinned back
Bangs that are kept in place by a hairclip or another hair ornament, or even a hairband, exposing parts of the forehead.
Compare with hair slicked back, where there is no object blocking the bangs, or hair pulled back, where it's the whole hair, and not just the bangs.
Examples
- Danbooru post #7663078
- Danbooru post #7871914: Pinned back by hairband
- Danbooru post #7721619: Manually pinned back