Literally, “to send to the horn”.
mandar al cuerno (first-person singular present mando al cuerno, first-person singular preterite mandé al cuerno, past participle mandado al cuerno)
- (idiomatic, colloquial) to tell someone to go to hell
- Synonyms: mandar a la mierda, mandar a freír espárragos, mandar a hacer puñetas