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to become misty; to become hazy
to get blurry; to grow dim
to be overshadowed; to be upstaged; to be outshone
朝靄で遠くの山がかすんで見えた。
The distant mountains looked hazy through the morning mist.
花粉の季節になると目がかすむことがある。
During pollen season, my vision sometimes gets blurry.
長時間の作業で目がかすんだ。
My eyes became blurry from working for a long time.