blue devils

Etymology
Originally apparitions supposed to be seen by sufferers of delirium tremens.

Noun

 * 1)  low spirits; depression
 * 2) * 1890,, , in the journal The Commonweal. (First published in book form 1890.)
 * "[…] the disease is either extinct, or exists in such a mild form that a short course of aperient medicine carries it off. It is sometimes called the Blue-devils now or the Mulleygrubs. Queer names, ain't they?"
 * 1)  depressants, especially the barbiturate amobarbital.

Translations

 * French: ,
 * Polish:
 * Russian: зелёная тоска́,