In a glaring or harshly shining manner; with an intense, bright, or exposed light.
Combination of the prefix 'a-' (in or at a state of) plus 'glare' (to shine with harsh brightness). 'Glare' comes from Middle English and possibly Scandinavian languages.
Like 'aglance,' this uses the archaic 'a-' prefix that was common in Middle English but fell out of fashion—yet we still use it unconsciously in words like 'afire,' 'afoot,' and 'afraid.'
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