noun (in Britain)
Examples from the Web for blue bag
Lady Jane left the room, and returned with a blue-bag, which she applied to James's swollen hand and cheek.
The wife of William East, an English paper-maker, accidentally let a blue-bag fall into one of the vats of pulp.The Scrap Book, Volume 1, No. 3|Various
Ask Jim Crute, with his ear like a blue-bag, that he chucked out o' the bar like a kitten, last week!The Hole in the Wall|Arthur Morrison
Or, a washerwoman's blue-bag, applied in the same manner, will have a like effect.Mrs. Hale's Receipts for the Million|Sarah Josepha Hale
His face was not improved by the blue-bag, and his expression was that of a hunted animal.