The first one, we have already used it "CARA DE PÓQUER"
It has its origin in card games, because when you play poker it is important that the opponent does not know what cards you have. The good poker player does not look happy when he receives good cards, nor does he look sad or disappointed when he receives very bad cards; it remains with expression, or with a neutral expression. Well, stay with a poker face comes to say that, you do not know what gesture to do in a situation and you remain expressionless.
The second is "A CABALLO REGALADO NO LE MIRES EL DIENTE"
Veterinarians analyze the teeth of a horse to know the quality of it and his health, but when someone uses this expression means that if you give something "free", if you give something, you should not complain about that gift even if you do not like Imagine that you sign up for an academy to study in Barcelona and they give you a small backpack to carry the notes, possibly a backpack is not very nice, a fine fabric that will break in a few days and you will prefer to carry your Nike backpack and not use that never, but you cannot demand it, because they have given it to you! Surely you will find some use, even if it is to keep your shoes when you travel;)
We know that living in Barcelona is not easy for a foreign student who does not know the language, so we want you to learn and be able to use those expressions that local students use often.
If this is the first time you read our section of local expressions, you can take a look at all those that we have already explained and master the language.
Tell your classmates in your student apartment in Barcelona and above all, try to use them when you talk to them and, surprise them with your command of the language!