Definition of blue bag in English:

blue bag

noun

  • 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.

Origin

Late 18th century.

Pronunciation

blue bag

/ˈbluː baɡ/