What is Renuncio (revoke)?

A renuncio (revoke) is breaking a playing obligation, such as not following suit when you could or not beating a card when you must.

It is usually penalised with the loss of the hand or the points at stake, as agreed at the table.

In Mus, renuncio also refers to any breach of the rules, such as showing your cards. On Lascuarenta.es (The Forty) the game only lets you play valid cards, so a revoke cannot happen.