Flashes or shines brightly (verb), or small bright flashes of light or reflections (noun).
The third-person singular present verb form and the plural noun form of glint, with -s showing either singular verb agreement or plural number.
A single glint might be an accident, but 'glints' suggest a pattern—'glints of sunlight' implies repeated flashes, which is why the word is so common in nature writing, where light rarely stays still.
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