A archaic or dialectal term, possibly referring to a type of flower or plant with blue coloring, or a variant of 'bluebottle'.
From blue (Old English blew) plus a second element possibly from blau or related to archaic English words. The exact etymology is uncertain due to the word's obscurity in modern English.
Words like 'blueblaw' that appear in old dictionaries but aren't used anymore are linguistic fossils—they tell us how languages constantly shed words they don't need, like an evolutionary dead end in vocabulary!
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