One of the mysteries of the English language finally explained.
1A barrister's (originally a solicitor's) brief bag made of blue fabric, now typically carried by a junior barrister.
2A person carrying such a bag; a barrister.
3A bag containing laundry blue, used to whiten fabrics and formerly also to treat insect bites and stings.
Late 18th century.
blue bag/ˈbluː baɡ/
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