- Cuernear: to cheat on someone.
- Cornudo: cuckold.
- Echar una cana al aire: to cheat on someone, to sow one’s wild oats.
- Estar de pirata: to go out with a woman in secrecy to hide that you are cheating on your wife.
- Engañar: to cheat on someone.
- Tener un romance: to have an affair.
- Tener una aventura: to have an affair.
- Tirar(se) una cana al aire: to cheat on someone, to sow one’s wild oats.
- Pata de lana: the other man.
- Pegar el salto a alguien: to cheat on someone.
- Pegársela (a alguien): to cheat on someone.
- Poner los cuernos a alguien: to cheat on someone.
- Poner / montar los cachos: to cheat on someone.
- Sacar la vuelta: to cheat on someone.
- Ser infiel: to be unfaithful.
- Serruchar el piso: to undermine someone in order to take something (or someone, in case of a relationship) from them.
