continuously or unceasingly vicious and destructive:
cat-and-dog competition.
Slang. (of a security) highly speculative and of questionable value.
Historical Examples

Never such a cat-and-dog life as they’ve been leading ever since!
Tess of the d’Urbervilles Thomas Hardy

But ever since the znaharka’s blessing had been accorded to this particular union the pair had led a cat-and-dog life.
The Romance of the Woods F. J. Whishaw

Skippy, whose relations with the opposite sex were of the cat-and-dog variety, solemnly raised his hand.
Skippy Bedelle Owen Johnson

Consternation versus Hilarity went racing suddenly like a cat-and-dog combat across his eyes.
Peace on Earth, Good-will to Dogs Eleanor Hallowell Abbott

They smiled and were gracious, called each other Butterwell and Crosbie, and abstained from all cat-and-dog absurdities.
The Last Chronicle of Barset Anthony Trollope

Vandyke’s no angel, and he and March have been doing a bit of the cat-and-dog act in a quiet way lately.
Secret History Revealed By Lady Peggy O’Malley C. N. Williamson and A. M. Williamson

We lived a cat-and-dog existence, and parted with mutual recriminations, since when I have not seen her!
The Imaginary Marriage Henry St. John Cooper

The mutual affection of these two animals is unbounded, and yet we hear human disagreements compared to cat-and-dog life!
Chatterbox Stories of Natural History Anonymous

But I always felt sure that she did the deed, for it was proved they led a cat-and-dog life.
Pretty Geraldine, the New York Salesgirl Mrs. Alex. McVeigh Miller

Lady Flo: Nevertheless, I assure you they lead a cat-and-dog existence.
The Strand Magazine, Volume V, Issue 25, January 1893 Various


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