Castigo translates to "punishment." It's a strong and dramatic word that immediately grabs attention, suggesting a consequence for past actions.
In the context of the song, the singer repeatedly warns the other person that their suffering and unhappiness will be a "castigo" for their lies and for making the singer suffer. It's used to convey a sense of poetic justice and retribution, making it a central theme of the lyrics.
Have you ever been so hurt by someone that you wished they'd think about you constantly? That's exactly what Claveles De La Cumbia is singing about in "Minuto A Minuto." This song is a powerful message to an ex-lover, making it clear that while they'll never be the singer's love again ("nunca vas a ser mi amor"), they're also not going to escape the memories.
The singer is pretty blunt, telling their former partner that they'll be thinking about them "minuto a minuto, segundo a segundo" [minute by minute, second by second] and that "vayas donde vayas no serás feliz" [wherever you go, you won't be happy]. Ouch! It's a declaration that the ex will suffer, knowing the singer is aware of their pain. The lyrics suggest the ex "sufriendo por verme otra vez" [suffering to see me again] and that all the memories will "atacan" [attack] them. It's a strong, almost vengeful, take on a breakup, where the singer believes the ex's suffering is a well-deserved "castigo por mentir" [punishment for lying] and for making them suffer.