Hello KarinaH,
Besides "idioms" as Mario said very well, they're known as "modismos".
Also, at least in Spain, often refer to them as "frases hechas".
Spanish is also full of idioms. Here at this link, I put a lot of them of common use in Spain with an example of each one:
☛ http://www.italki.com/question/253491
Hope this helps you, KarinaH. Have a nice day!
2014년 8월 3일
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"Idioms" in Spanish are "expresiones idiomáticas".
2014년 7월 31일
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Además de expresiones idiomáticas, en un lenguaje mas coloquial se podría traducir por "expresiones" o "formas de hablar".
2014년 8월 1일
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Hello. The word idioms in Spanish are phrases that have a figurative meaning. For example, If somebody say in Spanish "Esto fue pan comido" it doesn't mean that somebody ate a piece of bread. It mean that something was very easy.