In a manner that is in accordance with or relates to the Bible; according to biblical principles or teachings.
From 'biblical' plus the adverbial suffix '-ly.' This standard adverb form allows speakers to modify verbs and adjectives with biblical reference, appearing commonly in religious discourse since the 1800s.
When someone says 'biblically speaking,' they're claiming their interpretation comes straight from the Bible—but interestingly, people with completely opposite views use the exact same phrase. The adverb doesn't settle the argument; it just frames it.
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