In every way or manner; however one looks at it; regardless of how something is done.
Compound of 'every' (Old English 'æfre' + 'each') and 'how' (Old English 'hū'). This archaic adverbial formation means 'in every possible manner'.
This word pattern—'every' + interrogative adverb—was productive in older English, giving us 'everyhow', 'everyway', and 'everywhen', a creative system for making universal adverbs we've mostly abandoned!
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