To move with a sudden jerk or flourish; to make a quick twisting or flicking motion.
Possibly a blend of 'flirt' and 'flur(ry)' or an independent imitative formation, with uncertain origins in English dialect.
This obscure verb might be what happened in English when 'flirt' (to move lightly) met 'flurry' (sudden movement), creating a word for that specific quick-twitch motion—like flicking something away with a sharp wrist movement.
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