The action of staring with wide eyes, often in surprise, shock, or fascination; looking with bulging eyes.
Present participle of 'goggle,' from Old Norse or Scandinavian roots possibly related to the physical bulging of eyes. The word likely originated as onomatopoeia or descriptive of the action itself.
Watching someone do a double-take or react in shock, their eyes goggling out of their head, is such a specific and visual description that it's amazing it was captured in one short word.
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