to beat a dead horse, to harp on
Não entendo a razão de você falar sempre de comprar um gato, batendo sempre na mesma tecla!
I don't understand why you always talk about buying a cat, harping on the same thing!
The typewriter offers an image for bater na mesma tecla ("to hit the same key"): texts are produced by pressing mechanical keys. Just as a typist striking one key over and over prints the same letter again and again, a person who keeps returning to the same point repeats it without end.
Source: Michaelis.
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