His mouth opened a little, and he looked at Gatsby, and then back at Daisy as if he had just recognized her as some one he knew a long time ago.

from F. Scott Fitzgerald – The Great Gatsby (Chapter VII) on Rap Genius

Meaning

Tom is so astonished that his wife could ever possibly love another man that his jaw drops in an almost cliché moment. A powerful metaphor is used in the second half of the phrase to further emphasise his shock. He is looking at her with fresh eyes and has seen a little more of her personality than he saw before then.

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