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glint in (one's) eye(s)
1. A brief and subtle expression in one's eye(s) indicating a hidden or secret emotion, agenda, idea, plan, etc. She said that she was happy for both of them, but I knew by the glint in her eye that she despised Mark's new girlfriend. My father, with a glint in his eyes, told me that I would get the best present after the party was over.
2. A person or thing that has been planned or discussed but has not yet come into being. Jonathan says he's going to write the great American novel, but it's just a glint in his eye at this point. I knew your parents back when you were just a glint in their eyes.
glint with (something)
To shimmer or twinkle with something. Katie's engagement ring looked especially stunning as it glinted with sunlight. Lydia's eyes glinted with emotion as she listened to the toast in her honor.
glint with something
to sparkle or shine with something. Her bright eyes glinted with the sunlight. The crystal goblet glinted with the orange firelight.