verb
to bust one's balls; to break one's back
“Yo me rompí los cuernos hasta dar con el nombre adecuado —¡por consenso!— para mi hijo: Yago, variante española de Jacob, que significa «Dios ha protegido».” — I broke my back finding the right name (by consensus!) for my son: Yago, the Spanish variant of Jacob, which means "God has protected".
Synonyms: romperse los codos
Literally, “to break one's horns”.