Having eyes wide open and staring, often in surprise, shock, or fascination; wearing goggles.
From 'goggle' (verb), meaning to stare with wide eyes, possibly from a Scandinavian source or onomatopoeia suggesting bulging. The adjective form developed from descriptions of this wide-eyed state.
The expression 'goggle-eyed' became so common in describing shocked expressions that it's basically a set phrase in English—like someone's eyes might literally bulge out on springs when they're surprised enough.
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