(1) A headdress or something worn on the head. (2) In photography, 'kaburi'—fogging or darkening of an image due to exposure/development issues. (3) A covering or coating; meaning varies with context.
祭りでは伝統的な被りが使われ、色鮮やかな衣装が目立っていた。
At the festival traditional headgear was used, and the colorful costumes stood out.
古いネガをスキャンしたら、被りがあってコントラストが低くなっていた。
When I scanned the old negatives there was fogging, and the contrast was reduced.
塗装の被りを防ぐために、マスキングテープで境界をしっかり保護した。
To prevent paint overlap/bleeding, I protected the edges carefully with masking tape.