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 expression bater na mesma tecla ("to hit the same key") comes from the age of the typewriter, when texts were produced on 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: escreva.ai.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
