Dictionary.com

black dog

noun Informal.

melancholy; despondency; the blues: The black dog is over him.

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Origin of black dog

First recorded in 1700–10

Words nearby black dog

Black Death, black diamond, black diet, black disc, black disease, black dog, black duck, black dwarf, black earth, black economy, blacken
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for black dog

black dog

noun

informal depression or melancholy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012