From Middle English blessen, from Old English bletsian ("to consecrate (with blood)"), from Proto-West Germanic *blōdisōn ("to sprinkle, mark or hallow with blood"), from Proto-Germanic *blōþą ("blood"), of uncertain origin, possibly from Proto-Indo-European *bʰleh₃- ("to bloom"). Cognate with Old Norse bleza ("to bless") (whence Icelandic blessa), Old English blēdan ("to bleed"). More at bleed.
An ellipsis for an expression such as bless someone's heart.
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