Definition of cat–and–dog
1 : resembling or having the character of the proverbial antagonism of dogs and cats: a : quarrelsome inharmonious they led a cat-and-dog life together — Ellen Glasgow b of a fight : malicious and incessant the cat-and-dog fight among the early wire companies — F. L. Mott
2 : being or consisting of cheap or questionable securities : highly speculative cat-and-dog stocks are swinging through sensational gyrations—rising 100 percent in ten days, then collapsing — Sylvia F. Porter
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