WordReference English-Spanish Dictionary © 2015:

Compound Forms:
al revés de loc preplocución preposicional: Unidad léxica estable formada de dos o más palabras que funciona como preposición ("a favor de", "en torno a"). (al contrario de)contrary to adj + adv
  as opposed to preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours."
sino al revés  (US)the other way around exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
  (UK)the other way round exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
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'al reves' found in these entries
In the Spanish description:
English:

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