ser otro cantar

Literally, “to be another ballad”.

ser otro cantar (first-person singular present soy otro cantar, first-person singular preterite fui otro cantar, past participle sido otro cantar)

1. (idiomatic, defective) to be another story; to be a whole nother story

• harina de otro costal

• “ser algo otro cantar”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.7, Royal Spanish Academy [Spanish: Real Academia Española], 2023 November 28