poñer os cornos

Literally, “to put horns on”; compare Spanish poner los cuernos, English put horns on or Russian наста́вить рога́ (nastávitʹ rogá).

poñer os cornos (first-person singular present poño os cornos, first-person singular preterite puxen os cornos, past participle posto os cornos)

1. (idiomatic) to cheat on, put horns on
   • 1459, Anselmo López Carreira (ed.), Fragmentos de notarios, doc. 164:

     Iten Costança de Riba davia diso porlo dito juramento que feito avya que lle oyra diser que disera a dita Costança Vasques que era huna puta que posera as cornas ao marido

     Item, Constanza de Ribadavia said, by that oath that she had done, that she heard that said Constanza Vázquez was a slut that had put horns on her husband

• Antón Luís Santamarina Fernández, editor (2006–2013), “cornos”, in Dicionario de Dicionarios da lingua galega [Dictionary of Dictionaries of the Galician language] (in Galician), Santiago de Compostela: Instituto da Lingua Galega
• Antón Luís Santamarina Fernández, Ernesto Xosé González Seoane, María Álvarez de la Granja, editors (2003–2018), “poñer os cornos”, in Tesouro informatizado da lingua galega (in Galician), Santiago de Compostela: Instituto da Lingua Galega
• Rosario Álvarez Blanco, editor (2014–2024), “poñer os cornos”, in Tesouro do léxico patrimonial galego e portugués (in Galician), Santiago de Compostela: Instituto da Lingua Galega, →ISSN