RichThesaurus
black as a dog's guts
vs
black as the ace of spades
black as a dog's guts
adj
Utterly black; pitch-black.
black as the ace of spades
adj
Utterly black; pitch-black.
How often have the words
black as a dog's guts
and
black as the ace of spades
occurred in a corpus of books?
(source:
Google Ngram Viewer
)