To see someone in a new light or with renewed respect after they have shown improvement.
指别人已有进步，不能再用老眼光去看他。
《三国志·吴志·吕蒙传》注引《江表传》士别三日，即更刮目相待。”
After he aced the exam, his classmates began to see him with new eyes.
Learn the next connected idiom: 刮目相看 (guā mù xiāng kàn) → 看家本领 (kān jiā běn lǐng)
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