A small hard flash of light that is there and gone. Sun catches the edge of a ring, a wet rail, a pair of glasses, and for half a second one bright point jumps out at you. The thing is not burning or glowing; it is sending light back, so a glint needs a light source somewhere and a hard shiny surface to bounce off. Everything the word does grows out of that half second: you can watch it from the object's side or the light's side, you can count it as one flash, and you can put it on a person's face, where a feeling shows for a moment and is put away again.
From the word’s history
The supplied evidence takes glint from Scots glint, from Middle English glenten, to shine, gleam, flash, probably from Old Norse, and back to a root meaning to shine. The oldest recorded meaning is already a flash rather than a steady light, which is why short is built into the word and not added by the sentence around it.
資料上 glint 來自蘇格蘭語 glint，更早是中古英文 glenten（發光、閃一下），可能源自古北歐語，最上游的字根就是「發亮」。最早記下來的意思本來就是「閃一下」，不是持續地亮。所以「短」這件事是字本身就有的，不是靠句子補的。
Wiktionary etymology note supplied in packet (kaikki:3f6f69a190036ae4:1071638158:10045)
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