Some examples of word usage: blackening
1. The chef is blackening the salmon on the grill. (シェフはサーモンをグリルで焼いている)
2. The old buildings were blackening with age. (古い建物は年月とともに黒ずんでいた)
3. She used a blackening agent to darken the wood for her project. (彼女はプロジェクトのために木材を黒くするための塗料を使った)
4. The storm clouds were blackening the sky, signaling an impending storm. (嵐雲が空を黒ずめ、近づく嵐を知らせていた)
5. The fire was blackening the walls of the old house. (火災が古い家の壁を黒ずめていた)
6. The pollution from the factory was blackening the river water. (工場からの汚染が川の水を黒ずませていた)