Middle English, from Old Englishblētsian, fromblōd blood; from the use of blood in consecration
before the 12th century, in the meaning defined atsense 1
“Bless.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bless. Accessed 3 Apr. 2025.
Old Englishblētsian, blēdsian "to bless, to consecrate (originally with blood)," derived fromblōd "blood"
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Merriam-Webster unabridged