Well, there's Metta Bhavana. Metta is called "one of the four immeasurables", and Bhavana means "development" or "cultivation".

>Right speech, explained in negative terms, means avoiding four types of harmful speech: lies (words spoken with the intent of misrepresenting the truth); divisive speech (spoken with the intent of creating rifts between people); harsh speech (spoken with the intent of hurting another person's feelings); and idle chatter (spoken with no purposeful intent at all).
https://www.accesstoinsight.org/lib/authors/thanissaro/speech.html

So cursing could be harsh speech.

>"Harsh speech — when indulged in, developed, & pursued — is something that leads to hell, leads to rebirth as a common animal, leads to the realm of the hungry shades. The slightest of all the results coming from harsh speech is that, when one becomes a human being, it leads to unappealing sounds.
https://www.accesstoinsight.org/tipitaka/an/an08/an08.040.than.html